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Find the missing number ___:7 = 12:21a.14b.12c.4d.3
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Find the missing number ___:7 = 12:21a.14b.12c.4d.3

User Liero
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x:7=12:21\to(x)/(7)=(12)/(21)\ \ \ |cross\ multiply\\\\21x=7\cdot12\\21x=84\ \ \ |divide\ both\ sides\ by\ 21\\\boxed{x=4}\\\\Other\ method:\\(x)/(7)=(12)/(21)\\\\21:7=\boxed3\to12:\boxed3=4\\\\\boxed{(4)/(7)=(12)/(21)\to4:7=12:21}
User Sportzpikachu
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