Question

what is the missing number?
3/7 of ? = 18​

Answer 1

Answer:

3/7*X= 18

X = 18*7/3

X = 6*7

X = 42

Answer 2

$Let \: the \: missing \: be \: x, \\∴ ( \frac{3}{7} ) \times x = 18 \\ ∴3 \times x = 18 \times 7 \\ ∴3x = 126 \\ ∴x = \frac{126}{3} \\ ∴x = 42 \\ ∴The \: missing \: number \: is \: 42.$