Question

Mona painted $\frac{1}{5}$ of a wall white $\frac{2}{12}$ grey and rest blue. what portion of the wall was painted blue?

Answer 1

Portion of wall painted white = $\frac{1}{5}$

Portion of wall painted grey = $\frac{2}{12}=\frac{1}{6}$

Total portion of wall painted white and grey $=\frac{1}{5}+\frac{1}{6}=\frac{1\times 6+1\times 5}{30}=\frac{11}{30}$

Portion of wall remaining $=1-\frac{11}{30}=\frac{19}{30}$

Hence, $\frac{19}{30}$ portion of the wall will be painted blue.