JAMB Mathematics questions

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

All JAMB WAEC

Question 481· 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 482· Variation· JAMB
x varies inversely as y. If y is doubled, x is
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Answer: B. halved
Explanation and discussion
Question 483· 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 484· 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
Question 485· Variation· JAMB
P varies jointly as Q and R. If P = 24 when Q = 2 and R = 3, find P when Q = 5 and R = 4.
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Answer: C. 80
Explanation and discussion
Question 486· Variation· JAMB
The area of a circle varies as the square of its radius. If the radius is tripled, the area is multiplied by
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Answer: C. 9
Explanation and discussion
Question 487· Variation· JAMB
y varies inversely as x, and y = 3 when x = 4. Find x when y = 6.
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Answer: D. 2
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Question 488· Variation· JAMB
y varies as the square root of x, and y = 6 when x = 9. Find y when x = 25.
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Answer: A. 10
Explanation and discussion
Question 489· Variation· JAMB
P varies directly as Q. If P = 20 when Q = 4, find P when Q = 7.
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Answer: D. 35
Explanation and discussion
Question 490· Variation· JAMB
The cost of a metal ball varies as the cube of its radius. A ball of radius 2 cm costs ₦400. Find the cost of one of radius 3 cm.
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Answer: A. ₦1,350
Explanation and discussion
Question 491· Variation· JAMB
y varies directly as x, and y = 2.5 when x = 10. Which equation connects y and x?
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Answer: A. y = x/4
Explanation and discussion
Question 492· Variation· JAMB
y varies inversely as the square of x. If y = 4 when x = 3, find y when x = 6.
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Answer: B. 1
Explanation and discussion
Question 493· Variation· JAMB
V varies jointly as r² and h. V = 40 when r = 2 and h = 5. Find V when r = 3 and h = 4.
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Answer: A. 72
Explanation and discussion
Question 494· Variation· JAMB
C is partly constant and partly varies as n. C = 500 when n = 10 and C = 800 when n = 20. Find the constant part.
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Answer: A. 200
Explanation and discussion
Question 495· Variation· JAMB
T varies as the square root of L. If T = 2 when L = 4, find T when L = 16.
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Answer: D. 4
Explanation and discussion
Question 496· Variation· JAMB
y varies directly as x². If y = 12 when x = 2, find y when x = 3.
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Answer: C. 27
Explanation and discussion
Question 497· Variation· JAMB
The time to complete a job varies inversely as the number of workers. If 6 workers take 10 days, how long will 15 workers take?
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Answer: B. 4 days
Explanation and discussion

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JAMB Mathematics questions

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

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.

P varies jointly as Q and R. If P = 24 when Q = 2 and R = 3, find P when Q = 5 and R = 4.

The area of a circle varies as the square of its radius. If the radius is tripled, the area is multiplied by

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

y varies as the square root of x, and y = 6 when x = 9. Find y when x = 25.

P varies directly as Q. If P = 20 when Q = 4, find P when Q = 7.

The cost of a metal ball varies as the cube of its radius. A ball of radius 2 cm costs ₦400. Find the cost of one of radius 3 cm.

y varies directly as x, and y = 2.5 when x = 10. Which equation connects y and x?

y varies inversely as the square of x. If y = 4 when x = 3, find y when x = 6.

V varies jointly as r² and h. V = 40 when r = 2 and h = 5. Find V when r = 3 and h = 4.

C is partly constant and partly varies as n. C = 500 when n = 10 and C = 800 when n = 20. Find the constant part.

T varies as the square root of L. If T = 2 when L = 4, find T when L = 16.

y varies directly as x². If y = 12 when x = 2, find y when x = 3.

The time to complete a job varies inversely as the number of workers. If 6 workers take 10 days, how long will 15 workers take?