let

x = the age of Raju

y = the age of Ravi

Raju is twice as old as Ravi

x = 2y

10 years ago Raju was 7 times as old as Ravi

x - 10 = 7(y - 10)

by solving the system of equations

x = 2y

x - 10 = 7(y - 10)

we find

x = 24 years

y = 12 years

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Raju is 24 years old now, and Ravi is 12 years old now.