JAMB UTME - Mathematics - 1981
Pregunta 2 Informe
Which of the following fractions is less than one-third?
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Pregunta 3 Informe
Show that \(\frac{\sin 2x}{1 + \cos x}\) + \(\frac{sin2 x}{1 - cos x}\) is
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Pregunta 4 Informe
If \(\log_{2} y = 3 - \log_{2} x^{\frac{3}{2}}\), find y when x = 4.
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Pregunta 5 Informe
Solve \(\frac{1}{x + 1}\) - \(\frac{1}{x + 3}\) = \(\frac{1}{4}\)
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Pregunta 6 Informe
Two cars X and Y start at the same point and travel towards a point P which is 150km away. If the average speed of Y is 60km per hour and x arrives at P 25 minutes earlier than Y. What is the average speed of X?
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Pregunta 7 Informe
A baking recipe calls for 2.5kg of sugar and 4.5kg of flour. With this recipe some cakes were baked using 24.5kg of a mixture of sugar and flour. How much sugar was used?
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Pregunta 8 Informe
The difference between 4\(\frac{5}{7}\) and 2\(\frac{1}{4}\) greater by
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Pregunta 9 Informe
The positive root of t in the following equation, 4t2 + 7t - 1 = 0, correct to 4 places of decimal, is
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Pregunta 10 Informe
A cuboid has a diagonal of length 9cm and a square base of side 4cm. What is its height?
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Pregunta 12 Informe
An isosceles triangle of sides 13cm, 13cm, 10cm is inscribed in a circle. What is the radius of the circle?
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Pregunta 13 Informe
What is the length of an arc of a circle that substends 2\(\frac{1}{2}\) radians at the centre when the raduis of the circle = \(\frac{k}{k + 1}\) + \(\frac{k + 1}{k}\) then
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Pregunta 15 Informe
Marks scored by some children in an arithmetic test are:5, 3, 6, 9, 4, 7, 8, 6, 2, 7, 8, 4, 5, 2, 1, 0, 6, 9, 0, 8.
The arithmetic mean of the marks is
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Pregunta 16 Informe
In the figure, WU//YZ, WY//YZ = 12cm, VZ = 6cm, XU = 8cm. Determine the length of WU.
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Pregunta 17 Informe
Simplify \(\frac{\sqrt{2}}{\sqrt{3} - \sqrt{2}}\) - \(\frac{3 - 2}{\sqrt{3} + \sqrt{2}}\)
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Pregunta 18 Informe
The difference between the length and width of a rectangle is 6cm and the area is 135cm2. What is the length?
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Pregunta 19 Informe
A group of 14 children children received the following scores in a reading test: 35, 35, 26, 26, 26, 29, 29, 29, 12, 25, 25, 25, 25, 17. What was the median score?
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Pregunta 21 Informe
The sum of the root of a quadratic equation is \(\frac{5}{2}\) and the product of its root is 4. The quadratic equation is
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Pregunta 22 Informe
The number 25 when converted from the tens and units base to the binary base (base two) is one of the following
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Pregunta 23 Informe
The weights of 30 new-born babies are given as follow: 6, 9, 5, 7, 6, 7, 5, 8, 9, 5, 7, 5, 8, 7, 8, 7, 5, 6, 5, 7, 6, 9, 9, 7, 8, 8, 7, 8, 9, 8. The mode is
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Pregunta 25 Informe
simplify \(\frac{6^{2n + 1} \times 9^n \times 4^{2n}}{18^n \times 2^n \times 12^{2n}}\)
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Pregunta 26 Informe
In the figure, the chords XY and ZW are produced to meet at T such that YT = WT, ZYW = 40o and YTW = 30o. What is YXW?
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Pregunta 27 Informe
7 pupils of average age 12 years leave a class of 25 pupils of average age 14 years. If 6 new pupils of average age 11years join the class, what is the average age of the pupils now in the class?
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Pregunta 28 Informe
The area of a circular plate is one-sixteenth the surface area of a ball of a ball, If the area of the plate is given as P cm2, then the radius of the ball is
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Pregunta 29 Informe
In the diagram, XZ is the diameter of a circle's radius \(\frac{5}{2}\). If XY is 4cm, then the area of the triangle XYZ is
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Pregunta 30 Informe
If \(\sin x° = \frac{a}{b}\), what is \(\sin (90 - x)°\)?
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Pregunta 31 Informe
Evaluate \(\frac{6.3 \times 10^5}{8.1 \times 10^3}\) to 3 significant fiqures
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Pregunta 32 Informe
Solve the given equation \((\log_{3} x)^{2} - 6(\log_{3} x) + 9 = 0\)
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Pregunta 34 Informe
The ratio of the price of a loaf of bread to the price of a packet of sugar in 1975 was r : t. In 1980, the price of a loaf went up by 25% and that of a packet of sugar went up by 10%. Their new ratio is now
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Pregunta 35 Informe
Find the value of x satisfying \(\frac{x}{2}\) - \(\frac{1}{3}\) < \(\frac{2x}{5}\) + \(\frac{1}{6}\)
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Pregunta 36 Informe
Simplify T = \(\frac{4R_2}{R_1^{-1} + R_2^{-1} + 4R_3^{-1}}\)
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Pregunta 37 Informe
A sum of money invested at 5% per annum simple interest amounts to $285.20 after 3 years. How long will it take the same sum to amount to $434.00 at 7\(\frac{1}{2}\)% per annum simple interest?
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Pregunta 38 Informe
Find a two-digit number such that three times the tens digit is 2 less than twice the units digit and twice the number is 20 greater than the number obtained by reversing the digits
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Pregunta 39 Informe
In one and a half hours, the minute hand of a clock rotates through an angle of
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Pregunta 40 Informe
What is the area between two concentric circles of diameters 26cm and 20cm?
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Pregunta 41 Informe
A micrometer is defined as one millionth of a millimeter. A length of 12,000 micrometres may be represented as
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Pregunta 42 Informe
The first term of an Arithmetic progression is 3 and the fifth term is 9. Find the number of terms in the progression if the sum is 81
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Pregunta 43 Informe
In \(\bigtriangleup\)XYZ, XY = 3cm, XZ = 5cm and YZ = 7cm. If the bisector of XYZ meets XZ at W, what is the length of XW?
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Pregunta 44 Informe
If b = a + cp and r = ab + \(\frac{1}{2}\)cp2, express b2 in terms of a, c, r.
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Pregunta 45 Informe
What is the size of an exterior angle of a regular pentagon?
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Pregunta 46 Informe
Suppose x varies inversely as y, y varies directly as the square of t and x = 1, when t = 3. Find x when t = \(\frac{1}{3}\).
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Pregunta 47 Informe
By selling an article for N45.00 a man makes a profit of 80%. For how much should he have sold it in order to make a profit of 32%?
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