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Let X = Kumar's present age
Dollah's present age is 3X
X+12 = Kumar's age in 12 years
3X+12 = Dollah's age in 12 years
th sum of their ages in 12 years
sum means add
will equal 10X
Our equation is:
subtract 4X from both sides
divide 6 from both sides to get X by itself
Kumar's present age is 4 years old.
Dollah is 3X 3(4)=12 Dollah's present age is 12 years old.