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OpenStudy (anonymous):
(10/x)=(15/30)
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OpenStudy (anonymous):
x=20
OpenStudy (anonymous):
because 15/30 is equal to 1/2 so if you double 10 you get 20 and 10/20 is 1/2
OpenStudy (anonymous):
(x/10.5)=(157.5/52.5)
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