Mathematics Past Questions and Answers

In a class of 80 students, every students studies Economics or Geography or both. If 65 students study Economics and 50 study Geography, how many study both subjects?

A 15
B 30
C 35
D 45

Question 3067:

If N varies directly as M and N = 8 when M = 20 find M when N = 7

A 13
B 15
C \(17\frac{1}{2}\)
D \(18\frac{1}{2}\)

Question 3068:

Express 0.0462 in standard form

A 0.460 x 10^-1
B 0.462 x 10^-2
C 4.62 x 10^-1
D 4.62 x 10^-2

Question 3069:

In a bag of oranges, the ratio of the good ones to the bad ones is 5:4. If the number of bad oranges in the bag is 36, how many oranges are there in the altogether?

A 81
B 72
C 54
D 45

Question 3070:

A boy estimated his transport fare for a journey as N190 instead of N200. Find the percentage error in his estimate

A 95%
B 47.5%
C 5.26%
D 5%