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Hi KateM, let me try to help you out with this question too.

This question makes use of a ratio concept. Most of us call it Repeated Identity

The number of girls, after 20 percent has left, will become 4 units.

The ratio given at the end is 1 : 2. 

We should manipulate the ratio for the Girls. We find the common multiple of 2 and 4 so that the Girls can “become same”.

Then we go on to work out the answer shown in my workings above. 

 

Hope this helps! Feel free to PM me (:

http://www.futureachievers.com.sg

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