WAEC Mathematics 2021 Theory — Question 2
Question 2 of 22 from the West African Examinations Council (WAEC) Mathematics 2021 Theory paper, with the correct answer and a full explanation.
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1(b). Two consecutive numbers are such that the sum of thrice the smaller and twice the larger is 17. Find, correct to three significant figures, the smaller number as a percentage of the sum of the two numbers.
Model answer
Let the numbers be x and x+1. 3x+2(x+1)=17 → 5x+2=17 → x=3. The numbers are 3 and 4 (sum=7). Smaller as % of sum = (3/7)×100% = 42.9% (3 s.f.).
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