Question

mona painted 1/5 of a wall white 2/12 grey and rest blue. what portion of tha wall was painted blue.

Answer 1

Wall is painted with three colours
So (1/5)+(2/12)+x=1
Therefore x=19/30

Answer 2

Answer:

$\red { The\: portion \: of \: the \: wall }$

$\red { was \: painted \:blue}\green { =\frac{19}{30}}$

Step-by-step explanation:

$Let \: area \: of \: wall = x \:m^{2}$

$Area \: of \: wall \:painted \: white = \frac{x}{5}\:m^{2}$

$Area \: of \: wall \:painted \: grey\\ = \frac{2x}{12}\:m^{2}\\=\frac{x}{6}\:m^{2}$

$Area \: of \: wall \:painted \: blue \\= x - \left ( \frac{x}{5}+\frac{x}{6}\right)\\= x - \left( \frac{6x+5x}{30}\right)\\= x - \frac{11x}{30}\\= \frac{30x- 11x}{30}\\= \frac{19x}{30}\:m^{2}$

Therefore.,

$\red { The\: portion \: of \: the \: wall }$

$\red { was \: painted \:blue}\green { =\frac{19}{30}}$

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