WAEC Mathematics 2015 Theory — Question 7

Question 7 of 22 from the West African Examinations Council (WAEC) Mathematics 2015 Theory paper, with the correct answer and a full explanation.

4(a). By how much is the sum of 3(2/3) and 2(1/5) less than 7?

Model answer

Sum = 3⅔+2₁⁄₅ = 11/3+11/5 = (55+33)/15 = 88/15 = 5(13/15). Difference from 7: 7−588/15 = (105−88)/15 = 17/15 = 1(2/15).

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