There are 90 seniors in a high school. 60 of the seniors take mathematics, 35 of them take science and 15 take both classes. How many seniors take none of these two classes?

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21-02-2020
Mathematics

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There are 90 seniors in a high school. 60 of the seniors take mathematics, 35 of them take science and 15 take both classes. How many seniors take none of these two classes?

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kentho0922 kentho0922 · Answer 1 · 2020-02-21T00:40:19+01:00

Answer: The answer is 10 students.

Step-by-step explanation: Well first you know 15 take both so you can just subtract 15 from one of the numbers because the same student does not need to be counted twice. I chose to do 35-15 which equals 20. Then you do 60+20 to get 80. Lastly you subtract 80 from 90 to get 10.

I'm gonna go ahead and say I may not be correct because I don't know everything, but I answered to my best ability and got 10.