There are 30 red balls and x yellow balls in a bag. Given the probability of drawing a yellow ball is 7/13, find x.

A13

B30

C42

D35

Explanation: x/(30+x)=7/13 → 13x=210+7x → x=35.

Derived from ZIMSEC Mathematics Paper 2, November 1999, Q6

Get the full paper, not just one question

Danho has every sitting for this paper, with your progress tracked question by question, offline.