Ralph is 3 times as old as sarah. In 6 years, ralph will be only twice as old as sarah will be then. Find ralph's age now. If x represents sarah's age now, which of the following expressions represents ralph's age in six years?

X - S arah's age now

3x - Ralph is 3 times as old as Sarah, now

x+6 - Sarah's age in 6 years

2 (x+6) = 2x+12 - R alph will be only twice as old as Sarah will be in 6 years

Ralph's age in six year can be also written as 3x+6

So

Ralph's age now is 3x.

Ralph's age in six years is 2x+12 and 3x+6.

We can find age of Sara now,

2x+12=3x+6

3x-2x=12-6

x=6,

Ralph's age now is 3x=3*6=18

Now Sara is 6 years old, Ralph is 18 years old.