What is three fourths multiplied by twelve over twenty one?

Question

I don't understand this question.

Answer 1

three fourths multiplied by twelve over twenty one is the same as

(3/4) x (12/21)

First we can simplify the fraction 12/21 to become

12/21 = (4x3)/(3x7) = 4/7

 

So,  (3/4) x (12/21)  =  (3/4) x (4/7)

 

So this can then become,

(3/4) x (4/7)  =  (3x4) / (4x7)

= 3/7