Question 7

Find the LCM of 25/7, 15/28, 20/21.

Solution

LCM of a fraction means

(LCM of numerator/HCF of denominatior).

here,

$$25=5^2,15=5×3,20=5×2^2$$

and $$21=3×7,28=7×2^2$$

So,LCM(25,15,20)=$$5×3×2^2=300$$

and

HCF(7,21,28)=7.

So, required LCM=(300/7).

A is correct choice.

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