For questions like these, there will be a ratio to split a larger group into 2.
Each of the smaller group is divided into 2 smaller groups.
Students are required to make use of repeated identity concept in order to solve such questions.
These questions often appear in Paper 2.
Calculator usage is accepted.
The children in a dance hall are divided equally into 2 groups.
In the first group, there were 20 more girls than boys.
In the second group, there were 12 more boys than girls.
45% of all the children in the dance hall are boys.
How many children are there at the dance hall?
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| Vintage picture of children dancing in hall |
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