Question
A bag contains a certain number of balls of different
colors. The ratio of the number of black-colored balls to white-colored balls is 5:7, respectively, and the ratio of the number of white-colored balls to red-colored balls is 7:6, respectively. Find the total number of red-colored balls if the total number of black-colored balls in the bag is 15.Solution
 ATQ, Ratio of the number of balls of different colours Black : White : Red = 5 : 7 : 6 Let, the number of balls of black , White and Red colour in the bag is be 5x, 7x and 6x. Since, the total number of ball of black colour in a bag = 15 5x = 15 ⇒ x = 3 Therefore, number of Red colour ball in the bag = 6x = 18
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