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5s-r
5s - 6 = 2s, ie 5s - 2s = 6, ie 3s = 6, ie s = 2
f = s + 30, f/5 + s/3 = 14 or 3f + 5s = 210 3 x (s + 30) + 5s = 210 ie 3s + 90 +5s = 210 ie 8s = 120 so s = 15 Check: Father 45, son 15, 45/5 = 9, 15/3 = 5, 9 + 5 = 14 QED
i think there are 18 digit 5s.
90