Mathematics 2017 Objective — Question 1
Find the simple interest on N225 in 5 years at 10%.
- A. A. N108.00
- B. B. N224.00
- C. C. N112.50Correct
- D. D. N167.60
Explanation
I = PRT/100 = (225x10x5)/100 = N112.50.
All 40 questions from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2017 Objective paper, with the correct answer and a full explanation for each. Free, no signup needed.
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Find the simple interest on N225 in 5 years at 10%.
I = PRT/100 = (225x10x5)/100 = N112.50.
Find the range of 2,6,8,10,12,25,3,4 and 32.
Range = highest value - lowest value = 32 - 2 = 30.
A binary operation on the set of real numbers is defined by x * y = (x+y)/z for all x,y ∈ R. Find 7*5.
x*y=(x+y)/2 = (7+5)/2 = 6.
If the midpoint of (2,x) and (y,2) has respective values of x and y as
Midpoint formula: (2+y)/2=4, (x+2)/2=2. Solving gives y=6, x=2.
The histogram shows the number of participants in a meeting from Monday to Friday. How many participated on Monday, Wednesday and Thursday?
Reading the histogram bars for Monday, Wednesday and Thursday and summing them gives 50.
y is inversely proportional to x and y=6 when x=7. Find the constant of the variation.
y=k/x, so k=xy=7x6=42.
Convert 553 (base 7) to a number in base 10.
553(base7) = 5x7²+5x7¹+3x7⁰ = 245+35+3 = 283(base10).
If y varies directly as x, find the constant of the variation when y=12 and x=4.
y=kx, so k=y/x=12/4=3.
From the diagram, MNRS is a cyclic quadrilateral with angle 100° marked; find the value of x.
Opposite angles of a cyclic quadrilateral are supplementary; x = 180° - 100° = 80°.
Given: M={1,2,3,4,5}, N={1,2,4,5,3}, Z={2,1,4,5}. Which of the following is accurate?
M and N contain exactly the same elements, so N ⊆ M (N is a subset of, and equal to, M).
Find the number of sides of a regular polygon if the size of each interior angle is 150°.
Exterior angle = 180-150 = 30°; number of sides = 360/30 = 12.
Given that θ is an acute angle and tanθ = 12/5, find sinθ.
With opposite=12, adjacent=5, hypotenuse=13 (Pythagoras), sinθ = opposite/hypotenuse = 12/13.
Find the sum to infinity of the series 1/4, 1/12, 1/36, ...
a=1/4, r=1/3; Sum to infinity = a/(1-r) = (1/4)/(2/3) = 3/8.
The operation below was carried out in base 2. Find the missing number: 1011 + 1111 = 11010; missing number = ?
Given a+b+c=d and a,b,c known, the missing addend/number found by binary subtraction is 1000.
A box containing 10 black, 4 green and 6 yellow pens. What is the probability of picking a yellow pen with eyes closed?
P(yellow) = number of yellow pens / total pens = 6/20 = 3/10.
Evaluate 5(1/3) x 7(1/4) / (116/27).
Converting to improper fractions and simplifying: (16/3)x(29/4)/(116/27) = 8.
If x-3 divides x³-2x²-x+6, find the remainder.
By the remainder theorem, remainder = f(3) = 3³-2(3)²-3+6 = 27-18-3+6 = 12.
The locus of a point moving with equal distance from a fixed point is
A set of points equidistant from a fixed point (in a plane) traces a circle.
Solve x² - 5x + 6 ≤ 0.
Factorising: (x-2)(x-3) ≤ 0, giving 2 ≤ x ≤ 3.
Find the area of a parallelogram PQRS with base 16cm long and height 8cm.
Area of a parallelogram = base x height = 16 x 8 = 128cm².
If U={1,2,3...10} and N={2,4,6,8,10}, find N'.
N' (complement of N in U) contains elements in U not in N: {1,3,5,7,9}.
21, 21, 21, 22, 22, 22, 22, 23, 23, 24, 24, 24, 24, 24, 25, 26, 36, 36, 36. Find the mode of the distribution.
24 occurs most frequently (5 times), so it is the mode.
Find the determinant of |1 0 1; 1 1 0; 0 1 2|.
Expanding along the first row: 1(1x2-0x1) - 0 + 1(1x1-1x0) = 2 + 1 = 3.
21,21,21,22,22,22,22,23,23,24,24,24,24,24,25,26,36,36,36. Find the mean of the distribution.
Sum of all 19 values = 476. Mean = 476/19 ≈ 25.
From the top of a tree, the angle of depression to a point on the ground 5m away is 60°. Find the height of the tree.
tan60° = height/5, so height = 5tan60° = 5√3 m.
Factorize completely: 4u² - 36uv - uv + 9v².
Grouping: 4u²-36uv-uv+9v² = 4u(u-9v)-v(u-9v) = (4u-v)(u-9v).
Find the turning points of the function y = x³ - x² - x.
dy/dx = 3x²-2x-1 = 0 gives x = 1 or x = -1/3; substituting gives the turning points.
If Q=[3 -1 1; -2 1 -1; 1 -3 2], find -3Q.
Multiply every entry of Q by -3.
Find the number of ways the letters of the word COMMITTEE can be permuted.
COMMITTEE has 9 letters with M, T, E each repeated twice: 9!/(2!2!2!).
If P varies inversely as the square of q and p=4 when q=5, find p when q=2.
p=k/q²; k=pq²=4x25=100. When q=2, p=100/4=25.
Simplify log4 256 - log4 4 + 2.
log4256=4, log44=1: 4-1+2=5.
Express 0.265 in standard form.
0.265 = 2.65 x 10⁻¹ in standard form.
A car was put on sale for N12,000. It was sold for a discount of 20%. How much was paid for it?
Discount = 20% of 12,000 = 2,400. Amount paid = 12,000 - 2,400 = N9,600.
Find the value of x for which the function f(x) = 3x² - x - 6 is minimum.
f'(x)=6x-1=0, so x=1/6.
Determine the distance between points P(3,4) and Q(4,5).
d=√((4-3)²+(5-4)²)=√2.
Evaluate (5⁻³ x 5⁻⁴)/(5⁻⁶ x 5⁻²).
Numerator: 5^(-3-4)=5⁻⁷. Denominator: 5^(-6-2)=5⁻⁸. Dividing: 5^(-7-(-8))=5¹=5.
From the diagram, a triangle is inscribed with a circle; find the value of x.
The exterior angle of the triangle equals the sum of the two opposite interior angles: 65° = x° + 50°, so x = 15°.
The bar chart is a representation of a candidate's scores in UTME 2014 (Physics 75, Maths 45, Chem 60, Eng 30). Find his total score.
Total = 75+45+60+30 = 210.
A boy moves from a point P to another point Q due north. He then moves an equal distance to another point R due east. What is the bearing of R from P?
Moving equal distances north then east from P forms a right-angled isosceles triangle; the bearing of R from P is N45°E = 045°.
Find the common difference of an A.P. whose 4th term is 24 and 11th term is 52.
T4=a+3d=24, T11=a+10d=52. Subtracting: 7d=28, so d=4.
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