Question

calculate 42kg of 105kg as a percentage

Answer 1

$\frac{42\,\mathrm{kg}}{105\,\mathrm{kg}} = \frac{2\cdot21}{5\cdot 21} = \frac{2}{5} = \frac{4}{10}=40\%$

Answer 2

42 /105 *100 = 40%.........