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Math
Ratios and Proportions
Ratio of red balls to all balls in a box.
Three boxes contain 26, 28 and 30 balls. The ratios of red balls to all balls in each of these three boxes are 50%, 25%, and 20%. All the balls are placed in a large box. What is the ratio of red balls to all balls in the box?
1 answer
Ratio = (0.5*26 + 0.25*28 + 0.20*30)/(26+28+30) = 26/84 = 13/42.
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