Question

Lebo is four years older than Sello.In six years' time, the sum of their ages will be 40.How old is Lebo [hint: let Lebo's age be =x]

Answer 1

S = x - 4

(x+6) + ( S+6) = 40

Substitute x-4 for S and solve for x.

Answer 2

Sello is X years old.
Lebo is x+4 years old.

six years later:
x+6 + (x+4)+6 = 40.
2x + 16 = 40,
X = 12.
x+4 = 12+4 = 16 years = Lebo's age.