text: homework help plzz?? if son  is 20 years yonger than you now . in 10 more years u will be double his age. how old are you now? let your age be x and his age be y.  x = y + 20 10 + x = 2(y + 10)  substituting gives:  10 + y + 20 = 2y + 20 y = 10 x = 30  you are 30 years old.