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The common denominator for 2:3 and 5:7 is ___

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answer is A.

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Detailed Solution

Solution:

First, we will write ratios as fractions.

$\frac{2}{3}$ and $\frac{5}{7}$

Then, we will make the denominator as same.

7, 3 have not common.

Hence, LCM of 7,3 = Products of 7,3

= 7 x 3

= 21

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