10 years ago, ratio of the ages of a and b was 3 : 1 and after 10 years, the ratio of their ages will become 2 : 1. Find the sum of their present ages.
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Answer:100
Step-by-step explanation:
(3x+20)/(x+20)=2/1. X=20 then present total age is (3*20+10)+20+10= 100
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