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Reducing Equations to Simpler Form

Vinod is now3...

Question

Vinod is now3 times as old as her sister Kajal. In 4 more years he will be twice as old as Kajal will be then. How old are they now?

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Solution

Let Kajal's age is x then Vinod's age is 3x
After 4 years, Kajal's age = x+4 and Vinod's age = 3x+4
According to question, 3x+4 = 2(x+4)
x = 4
Kajal's age = 4 yrs and
Vinod's age = 12 years

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