Question

Ralph is 3 times as old as Sara. In 4 years, Ralph will be only twice as old as Sara 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 four years ?

3 x
6 x
2 x + 4
3 x + 4

Answer 1

ralph age =3x
after 4 year sara's age=x+4
ralph's age=2*(x+4)=2x+8
which must be equal to =3x+4
2x+8=3x+4
8-4=3x-2x
x=4

Answer 2

X+4 will represent ralph's age