Question

If a/b= 7/3 then find
the value of the ratio
7a + 9b / 7a - 9b​

Answer 1

Answer:

38/11

Step-by-step explanation:

a : b = 7 : 3

Let, a = 7x and b = 3x

Putting these values,

(7a + 9b)/( 7a - 9b)

= (7 * 7x + 9 * 3x) / (7 * 7x - 9 * 3x)

= (49x + 27x) / ( 49x - 27x)

= 76x / 22x

= 38/11