Question

the sum of two rational numbers is
$\frac { - 4}{5}$
if one them is
$\frac{ - 11}{20}$
Find the other ?
​

Answer 1

let the other no. be x.

$x + ( \frac{ - 11}{20} ) = ( \frac{ - 4}{5} )$

$x = ( \frac{ - 4}{5} ) - ( \frac{ - 11}{20} )$

$x = \frac{( - 16) - ( - 11)}{20}$

$x = \frac{ - 16 + 11}{20}$

$x = \frac{ - 5}{20} \: or \: \frac{ - 1}{4}$