You can put this solution on YOUR website! In 6 years time the combined age of my spouse and child will be 58.
Each will age 6 yrs; therefore:
58 - 12 = 46, their combined age now
:
What will it be in 11 years time?
Each will age 11 yrs, therefore:
46 + 22 = 68 is their combined age in 11 yrs