Question

What should be added to 7 4\15 to get 8 2\5?​

Answer 1

let the no to be x

so

x+74/15 = 82/5

x = 82/5 - 74 /15

LCM of 5,15 is 15

82/5 × 3 by both sides

74/15 ×1 by both sides

then

x=246/15 -74/15

x=172/15

is the answer I hope it will be help to you

Answer 2

Answer :-

$\sf{Let\ the\ number\ be\ x.}$

$\sf{\implies7 \dfrac{4}{5} + \: x \: = \: 8 \dfrac{2}{5}}$

$\sf{\implies \dfrac{109}{15} \: + \: x \: = \dfrac{42}{5}}$

$\sf{\implies \: x \: = \: \dfrac{42}{5} \: - \: \dfrac{109}{15}}$

$\sf{\implies \: x \: = \: \dfrac{126 \: - \: 109}{15}}$

$\sf{\implies \: x \: = \: \dfrac{17}{15}}$

$\implies{\sf{So,\ \dfrac{17}{15}\ should\ be\ added.}}$