Maths problem - percentages
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Joined: 15/04/2020 - 09:53
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Maths problem - percentages

There are 400 penguins in a zoo 

11/20 of them are male, 5/9 of the females lay one egg each.  All the chicks survive 

By what percentage has the number of penguins increased by 


How do I work this out, as the ways i have tried all end up with completly wrong answers like 543% which is way off base.

Thank you