19 Jan '09 22:11>
Mum is 21 year older than her son. After 6 years she will be 5 times older than her son. Where is dad?
Son's age - x
mum's age - x + 21
son's age after 6 years - x + 6
mum's age after 6 years - 5(x + 6)
5(x + 6) = x + 21 + 6
5x + 30 = x + 27
4x = -3
x = -3/4
-3/4 years = -9 months which leads us to the solution that dad is on mum.
Son's age - x
mum's age - x + 21
son's age after 6 years - x + 6
mum's age after 6 years - 5(x + 6)
5(x + 6) = x + 21 + 6
5x + 30 = x + 27
4x = -3
x = -3/4
-3/4 years = -9 months which leads us to the solution that dad is on mum.