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Question

Hi guys..can please help with this question. Thank you!

Answer

If there are 3u girls , there are 3u * 2 = 6u boys. In the class, there are in total 9u pupils.

1/2 * 6u = 3u boys are selected and 2/3 * 3u = 2u girls are selected. 

In total 3u + 2u = 5u pupils are selected. They are divided into 4 groups. 

Each group had 5u/4 pupils.

So fraction of group in the class = (5u/4)/9u = 5/36 

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