5+5-5+5-5+5-5+5-5
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9s - 9
iPhone 5
55 + 5/5
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
It can't be done using only five 5s, but using six 5s you can get it: 37 = 555/(5+5+5) it can be done using five 5's (5+5/5) ** 5) + 5 ** = power operation actually the above should be written as: ((5+5)/5)^5 + 5 5!/(5+5) + (5*5) will work also