1.

In a class, the number of boys and the number of girls are in the ratio of 4 : 5. If 10 more boys join, the ratio of the number of boys to the number of girls becomes 6 : 5 . How many girls are there

Answer»

25



Let the NUMBER of boys and girls be 4x and 5x.
When 10 more boys JOIN the calss the number of boys becomes 4x + 10
and number of girls = 5x.
Given ratio = 4x + 10/5x = 6/5
= 20x + 50 = 30X
= 10x = 50x = 5
So, number of girls = 5x= 5 X 5= 25



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