Respuesta :

I would say a. is not very common. 
I did not calculate the rest, I am just canceling out one for you

Least common denominator of the fractions 4 / 35 , 1 / 28 and 3 / 8 is 280.

What is Least common denominator?

"Least common denominator is  equals to the least common multiple of all the denominator of the given set of fractions. In short it is known as LCD or LCM."

According to the question,

Given fractions are,

4 / 35 , 1 / 28 and 3 / 8

Denominators of the given fractions are 35, 28 and 8.

Prime multiples of denominators

35 = 7 × 5

28 = 7 × 2 × 2

8 = 2 × 2 × 2

Least common denominator of ( 35, 28, 8) = 7 × 5 × 8

                                                                       = 280

Hence, least common denominator of the fractions 4 / 35 , 1 / 28 and 3 / 8 is 280.

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