Question

Which of the following is an equivalent ratio of 5: 7?
A) 7:5
B) 15:7
C) 5:21
D) 15:21​

Answer 1

ANSWER:-

The correct option is D) 15:21

Explanation-

5:7 can be written in the form of 5/7.

And equivalent ratio is obtained by multiplying the same number in numerator and denominator of the fraction.

So, equivalent of 5/7 are,

(5/7)×(2/2) = (10/14)

(5/7)×(3/3) = (15/21)

(5/7)×(4/4) = (20/28)

and so on.

Therefore, (5/7)×(3/3) = (15/21) is the correct option.

THANKS.

Answer 2

D) 15:21 is the correct option.

Since the given ratio is,

                                   5:7

Now, from the given options,

The first three given ratios cannot be further divided to reach any other equivalent ratios.

But in the fourth option, it can be further divided to find its equivalent ratio.

So,

                                   $\frac{\c{15}}{\c{21}}$      $=~~~~\frac{\c{5}}{\c7}$

So, the equivalent ratio for the given ratio is 15:21.