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Mathematics 13 Online
OpenStudy (anonymous):

the problem is 15/blank=21/7

OpenStudy (anonymous):

1. Cross Multiply Both side * should have 15x7, 21x(times)X 2. 15|dw:1317853672044:dw| then|dw:1317853713147:dw| now you divide|dw:1317853760868:dw| X= 5

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