The age of the two friends were in the ration of 6: 5. if the sum of their ages is 55. then after how many years their ratio will become 8: 7? a.11 b.7 c.10 d.12

Ratio is 6:5, the sum is 55.

6x + 5x = 55

11x = 55

x = 55/11

x = 5

Their ages now are:

6*5 = 30 years old

5*5 = 25 years old

Lets find their ages for the ratio of 8:7

Let y = years:

30 +y / 25 +y = 8/7

Cross multiply:

8(25 +y) = 7(30 +y)

200 + 8y = 210 + 7y

y = 10

The answer is C.10

1.3

step-by-step explanation:

3x2=6   9x+6

bring down the 6 on both sides

6+6=12

12= 9x

divide by 9

12/9 =

1.3 =x