jamifahad wrote:
From a group of boys and girls, 15 girls leave. There are then left two boys for each girl. After this 45 boys leave. There are then 5 girls for each boy. The number of girls in the beginning was:
1) 29
2) 40
3) 43
4) 48
5) None of these
Solve it using choices.
take choice 1) 29 girls
15 girls leave .So, only 14 girls left. Given 2 boys are left for each girl so number of boys should be 28.However , next step where 45 boys leave would not satisfy.
Lets try choice 2) 40 girls. 15 girls leave so left is 25 girls. Boys will be 50 then.
Next step ; 45 boys leave so only 5 boys left and 5 girls for each boy.Satisfies
This perfectly fits our conditions.Hence option (2)40 is the answer.
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