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A survey of $120$ teachers determined the following: $70$ had high blood pressure $40$ had heart trouble $20$ had both high blood pressure and heart trouble What percent of the teachers surveyed had neither high blood pressure nor heart trouble?

 Jan 19, 2021
 #1
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70+40=110 students with either condition

110-20 (because there are 20 repeats)=90 teachers with a condition

120-90=30 without conditions 

30/120=25%

 Jan 19, 2021
 #2
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Thanks!

Leafie  Jan 19, 2021

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