how do you solve this math problem

Mathematics
Tutor: None Selected Time limit: 1 Day

Apr 28th, 2015

The answer is B. The diagram shows that n is the difference between the total number of children who rode Twister on Friday and Saturday, so the answers A and D are excluded. The answer C is not true because there were just 165 boys (not 367 + 165) and 218 girls who rode Twister. 

Apr 28th, 2015

thankyou for your help...I have a question... how do you know N stands for the difference between the total number of children who rode twister on Friday and Saturday

Apr 28th, 2015

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Apr 28th, 2015
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Apr 28th, 2015
Dec 9th, 2016
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