Math problem solvimg
posted by Anonymous on .
Sally's grandfather is 67 tears old.
Sally is 19 years old.
At what age will Sally be exactly one third of her grandfather's age?
How old will her granfather be then?

( 67 + x ) / ( 19 + x ) = 3 Multiply blth sides by ( 19 + x )
67 + x = 3 ( 19 + x )
67 + x = 3 * 19 + 3 * x
67 + x = 57 + 3 x
67  57 = 3 x  x
10 = 2x
2 x = 10 Divide both sides by 2
x = 10 / 2
x = 5
Salys age will be 19 + 5 = 24
Granfathes age will be 37 + 5 = 72
72 / 24 = 3