Question

1/20+1/63=1/f what is value of f ?

Answer 1

$1 \div 20 \: + 1 \div 63 = 1 \div f \\ 63 + 20 \div 1260 = 1 \div f \\ 83 \div 1260 = 1 \div f \\ 1260 \div 83 = f \\ 15.180722916$

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