Question

The ratio of blue marbles to white marbles in a bag is 4 to 5. At this rate, how many blue marbles are there if there are 15 white marbles?

Answer 1

Blue marbles : white marbles = 4 : 5

Now, Let number of blue marbles be 4x and number of white marble me 5x.

But, number of white marbles are given 15 so, 5x = 15

=> x = 15/5

=> x = 3

Now, number of blue marbles = 4x

=> number of blue marbles = 4 x 3

=> number of blue marbles = 12

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