10 4s times 4 = 40 times 4 = 160
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You can achieve 39 using four 4s with the following expression: ( (4 \times 4 \times 4) - 4/4 ). This simplifies to ( 64 - 1 ), which equals 39.
4 + 4 + 4/4 + 4/4 = 10
It is: 4s = 64
It is 3 3/4
Equation 1. f = 13sEquation 2. f + 9 = 4(s + 9) ie f + 9 = 4s + 36 ie f = 4s + 27Substitute for f: 13s = 4s + 27Subtract 4s from each side: 9s = 27Divide each side by 9: s = 3 so f = 39 ( in 9 years s = 12, f = 48)