Question

find it please.with proper steps

Answer 1

$\frac{1}{r} = \frac{1}{10} + \frac{1}{40}$

Multiplying 4 in denominator and numerator,

$\frac{1}{r} = \frac{1(4)}{10(4)} + \frac{1}{40}$

$\frac{1}{r} = \frac{4}{40} + \frac{1}{40}$

$\frac{1}{r} = \frac{4 + 1}{40}$

$\frac{1}{r} = \frac{5}{40}$

$\frac{1}{r} = \frac{1}{8}$

$r = 8$

Answer 2

Hey mate


Here is ur ans

$1 \div r = 1 \div 10 + 1 \div 40 \\ \\ 1 \div r = 40 + 10 \div 400 \\ \\ 1 \div r = 50 \div 400 \\ 1 \div r = 1 \div 8 \\ \\ r = 8$
Hope it helps u


Be brainly ✌❤