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I don't know how to start or do number 21. I'm completely lost. I know the answer is 15 from the answer key.

I don't know how to start or do number 21. I'm completely lost. I know the answer is 15 from the answer key.
asked 44.5k views
3 votes
I don't know how to start or do number 21. I'm completely lost. I know the answer is 15 from the answer key.

I don't know how to start or do number 21. I'm completely lost. I know the answer-example-1
asked
User Akshay Kumar
by
7.9k points

1 Answer

4 votes
Use ratios. 80/12=100/x. x=15.

answered
User Quinnj
by
8.8k points
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