The present age ratio of A and B is 3 2 9 years hence this ratio becomes 9 7 Find the average of the...........

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The present age ratio of A and B is 3:2. 9 years hence this ratio becomes 9:7. Find the average of their age 5 years hence.

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Explanation:

Solution:
Present … 3 : 2
9 years hence….. 9 : 7
Now see -> 3 + 6 = 9 and 2 + 5 = 7. So first make their difference same by mutiplying by 2 in (1)
So Present 6 : 4
9 years hence….. 9 : 7
Now difference is 3each
So 3 == 9
1 == 3
A = 6 = 18
B = 4 = 12
Average age of A and B after 5 years = (18+5 + 12+5)/2 = 20