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OpenStudy (anonymous):
Solve the proportion.
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OpenStudy (anonymous):
OpenStudy (igreen):
Cross multiply: 10 * 30 = 300 a * 15 = 15a 300 = 15a Divide 15 to both sides: a = 20
OpenStudy (kobeni-chan):
Yes, or you can divide 15 by 30 and see that it is 1/2. Then you could multiply 10 by to and still get a=20
OpenStudy (anonymous):
Oh okay! Thant makes sense actually!
OpenStudy (igreen):
Yes, that's another way of doing it @kobeni-chan
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