Question

Two numbers are in the ratio 1:7. When 3 is added to each side, the ratio changes to 1:4. What is the difference between two numbers?
A) 12
B) 15
C) 17
D) 18
E) None of these

Answer 1

Answer:

18

Step-by-step explanation:

Let the nos. = x and 7x

(x + 3) / (7x + 3) = 1/4    (cross multiplying)

4 (x + 3) = 1 (7x + 3)

4x + 12 = 7x + 3

3x = 9

x = 3 and 7x = 21

Difference = 21 - 3

                  = 18