Exams › IBPS PO › Quantitative Aptitude
The ratio of the number of white to black balls in Q and S is 1:3 and 3:1, respectively. If the number of black balls in Q and S together is approximately what percent of the number of white balls in Q and S together?
- 75.23%
- 71.42%
- 81.78%
- 79.51%
Correct answer: 71.42%
Solution
Let white:black in Q be 1:3, so Q has W and 3W. Let white:black in S be 3:1, so S has 3x and x. Using the same scale for comparison, the combined black-to-white ratio becomes 5:7, which is about 71.42%.
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