Question

Solve the problem of maths

Answer 1

1/12.4 +1/6.84 =2/18.88 -1 =18.87

Answer 2

$( \frac{1}{12.4} + \frac{1}{6.84}) {}^{ - 1}$
$(\frac{6.84 + 12.4}{12.4 \times 6.84}) {}^{ - 1} \\ = (0.22648) {}^{ - 1} \\ = \frac{1}{0.22648 } \\ = 4.450...$
hence this is your answer