Trousers

In the class was 12 students. Nine students wearing trousers and turtleneck eight. How many students worn trousers with a turtleneck?

Correct result:

a =  5
b =  8

Solution:

a=9+812=5a=9+8-12=5
b=min(9,8)=8b=min(9,8)=8



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