Question
There are 400 boys and 100 girls in a school.
170 of them are Primary 3 pupils.
The rest are Primary 4 pupils.
How many Primary 4 pupils are there in the school?
3 m

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There are 400 boys and 100 girls in a school.
170 of them are Primary 3 pupils.
The rest are Primary 4 pupils.
How many Primary 4 pupils are there in the school?