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Seventy pupils (37 boys and 33 girls) are divided into two groups, with forty pupils in Group 1 and 30 pupils in Group 2. How many more boys are there in Group 1 than there are girls in Group 2?


If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.  

This problem is taken from the UKMT Mathematical Challenges.
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