JAMB and WAEC Mathematics questions

861 questions with answers and explanations. Tap an option to check yourself.

All JAMB WAEC

Question 821· Variation· WAEC
The cost of feeding students varies directly as their number. It costs ₦45,000 to feed 30 students. Find the cost for 42 students.
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Answer: C. ₦63,000
Explanation and discussion
Question 822· Variation· WAEC
F varies inversely as the square of d, and F = 20 when d = 3. Find F when d = 6.
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Answer: D. 5
Explanation and discussion
Question 823· Variation· JAMB
y varies inversely as x. If y = 6 when x = 4, find y when x = 8.
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Answer: D. 3
Explanation and discussion
Question 824· Variation· WAEC
If y varies inversely as x, what happens to y when x is doubled?
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Answer: D. y is halved
Explanation and discussion
Question 825· Variation· WAEC
y varies inversely as the square of x, and y = 4 when x = 3. Find y when x = 6.
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Answer: A. 1
Explanation and discussion
Question 826· Variation· WAEC
T varies inversely as the square root of L. If T = 6 when L = 16, find T when L = 36.
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Answer: C. 4
Explanation and discussion
Question 827· Variation· JAMB
The cost C of printing n copies is partly constant and partly varies as n. C = ₦500 when n = 10 and C = ₦800 when n = 20. Find C when n = 30.
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Answer: A. ₦1,100
Explanation and discussion
Question 828· Variation· WAEC
P varies inversely as Q. If P = 6 when Q = 4, find P when Q = 8.
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Answer: A. 3
Explanation and discussion
Question 829· Variation· JAMB
w varies inversely as the square of v. If v is doubled, w becomes
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Answer: C. one-quarter of its value
Explanation and discussion
Question 830· Variation· WAEC
If y ∝ x and y = 15 when x = 5, what is y when x = 8?
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Answer: D. 24
Explanation and discussion
Question 831· Variation· JAMB
y varies as the cube of x. If x is doubled, y is multiplied by
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Answer: A. 8
Explanation and discussion
Question 832· Variation· JAMB
p varies inversely as the square root of q, and p = 10 when q = 16. Find p when q = 25.
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Answer: C. 8
Explanation and discussion
Question 833· Variation· WAEC
y varies directly as x², and y = 18 when x = 3. Find y when x = 4.
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Answer: B. 32
Explanation and discussion
Question 834· Variation· WAEC
y varies as the square of x. If y = 18 when x = 3, find y when x = 5.
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Answer: D. 50
Explanation and discussion
Question 835· Variation· WAEC
A varies as the square of r, and A = 50 when r = 5. Find A when r = 8.
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Answer: A. 128
Explanation and discussion
Question 836· Variation· JAMB
y varies directly as x, and y = 15 when x = 5. Find x when y = 24.
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Answer: D. 8
Explanation and discussion
Question 837· Variation· WAEC
y varies jointly as x and the square of z, and y = 48 when x = 3 and z = 2. Find y when x = 2 and z = 3.
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Answer: D. 72
Explanation and discussion
Question 838· Variation· JAMB
x varies inversely as y. If y is doubled, x is
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Answer: B. halved
Explanation and discussion
Question 839· Variation· JAMB
y varies directly as x and inversely as z. y = 6 when x = 4 and z = 2. Find y when x = 9 and z = 3.
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Answer: B. 9
Explanation and discussion
Question 840· Variation· JAMB
z varies directly as x and inversely as y. If z = 6 when x = 3 and y = 2, find z when x = 4 and y = 8.
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Answer: C. 2
Explanation and discussion

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JAMB and WAEC Mathematics questions

The cost of feeding students varies directly as their number. It costs ₦45,000 to feed 30 students. Find the cost for 42 students.

F varies inversely as the square of d, and F = 20 when d = 3. Find F when d = 6.

y varies inversely as x. If y = 6 when x = 4, find y when x = 8.

If y varies inversely as x, what happens to y when x is doubled?

y varies inversely as the square of x, and y = 4 when x = 3. Find y when x = 6.

T varies inversely as the square root of L. If T = 6 when L = 16, find T when L = 36.

The cost C of printing n copies is partly constant and partly varies as n. C = ₦500 when n = 10 and C = ₦800 when n = 20. Find C when n = 30.

P varies inversely as Q. If P = 6 when Q = 4, find P when Q = 8.

w varies inversely as the square of v. If v is doubled, w becomes

If y ∝ x and y = 15 when x = 5, what is y when x = 8?

y varies as the cube of x. If x is doubled, y is multiplied by

p varies inversely as the square root of q, and p = 10 when q = 16. Find p when q = 25.

y varies directly as x², and y = 18 when x = 3. Find y when x = 4.

y varies as the square of x. If y = 18 when x = 3, find y when x = 5.

A varies as the square of r, and A = 50 when r = 5. Find A when r = 8.

y varies directly as x, and y = 15 when x = 5. Find x when y = 24.

y varies jointly as x and the square of z, and y = 48 when x = 3 and z = 2. Find y when x = 2 and z = 3.

x varies inversely as y. If y is doubled, x is

y varies directly as x and inversely as z. y = 6 when x = 4 and z = 2. Find y when x = 9 and z = 3.

z varies directly as x and inversely as y. If z = 6 when x = 3 and y = 2, find z when x = 4 and y = 8.