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'Forming Groups' printed from http://nrich.maths.org/
Seventy pupils (37 boys and 33 girls) are divided into two groups, with 40 pupils in Group 1 and 30 pupils in Group 2.
What is the difference between the number of boys in Group 1 and the number of girls in Group 2?
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This problem is taken from the UKMT Mathematical Challenges.