Question 602276
"Two years ago, a father was 8 times as old as his son" ___ f - 2 = 8(s - 2) ___ f = 8s - 14


"Ten years from now, the ratio of their ages will be 10:3" ___ (f + 10) / (s + 10) = 10 / 3 ___ 3f + 30 = 10s + 100


multiplying 1st equation by 10 ___ 10f = 80s - 140


multiplying 2nd equation by 8 ___ 24f + 240 = 80s + 800


subtracting equations ___ 24f + 240 - 10f = 80s + 800 - 80s - -140 ___ 14f + 240 = 940