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Variation - Jamb Mathematics Past Questions and Answers

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Jamb Mathematics Past Questions

Question 11:


If r varies inversely as the square root of s and t, how does s vary with r and t?

A. S varies inversely as r and t2
B. S varies inverely as r2 and t
C. S varies directly as r2 and t2
D. S varies directly as r and t


Question 12:


Five years ago, a father was 3 times as old as his son, now their combined ages amount to 110years. thus, the present age of the father is

A. 75 years
B. 60 years
C. 98 years
D. 80 years
E. 105 years


Question 13:


Father reduced the quantity of food bought for the family by 10% when he found that the cost of living had increased 15%. Thus the fractional increase in the family food bill is now

A. \(\frac{1}{12}\)
B. \(\frac{6}{35}\)
C. \(\frac{19}{300}\)
D. \(\frac{7}{200}\)
E. \(\frac{5}{100}\)


Question 14:


x is directly proportional to y and inversely proportional to z. If x = 9 when y = 24 and z = 8, what is the value of x when y = 5 and z = 6?

A. \(\frac{5}{6}\)
B. 11
C. 3\(\frac{3}{5}\)
D. 2\(\frac{1}{2}\)
E. 1\(\frac{1}{5}\)


Question 15:


The size of a quantity first doubles and then increases by a further 16%. After a short time its size decreases by 16%. What is the net increases in size of the quantity?

A. \(\frac{59300}{625}\)
B. \(\frac{50900}{625}\)
C. 200%
D. +100%






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