SOLUTION: please help me solve this word problem: Dollah is three times as old as Kumar. In 12 years' time the sum of their age will be equal to 10 times Kumar's present age. Find their pres

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Question 679076: please help me solve this word problem: Dollah is three times as old as Kumar. In 12 years' time the sum of their age will be equal to 10 times Kumar's present age. Find their present aage. THANKS
Answer by rm29924(97) About Me  (Show Source):
You can put this solution on YOUR website!
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:
X+12+3X+12=10X
4X+24=10X
subtract 4X from both sides
24=6X
divide 6 from both sides to get X by itself
X=4
Kumar's present age is 4 years old.
Dollah is 3X 3(4)=12 Dollah's present age is 12 years old.