If 9, m , 21 and 49 are in proportion , then the value of m is
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The ratio of 15 months to 5 years is
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9 : m :: 21 : 49
9 x 21 = 189
m x 49 = 189
m = 189 / 49
m = 3
9 x 21 = 189
m x 49 = 189
m = 189 / 49
m = 3
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