a) Amount of paint she can use on each wall is 1/10
b) Amount of paint that will be used for 3/4 wall is 3/40
Explanation:a) Total wall to be painted = 3 walls + 3/4 of a wall = 3 3/4 walls
Total wall to be painted =15/4
Amount of paint left to be used = 3/8
To get the number of paint she can use on each wall, we would divide the number of paint left by the total walls
[tex]\begin{gathered} \frac{\frac{3}{8}}{3\text{ 3/4}}=\frac{\frac{3}{8}}{\frac{15}{4}} \\ =\text{ 3/8 }\div\text{ 15/4} \\ we\text{ apply the KCF: k}eep,\text{ change, flip} \end{gathered}[/tex]We keep the first fraction, change the sign to multiplication and flip the 2nd fraction.
[tex]\begin{gathered} \text{Flip 2nd fraction = flip 15/4= 4/15} \\ \text{Change sign} \\ \frac{3}{8}\times\frac{4}{15}=\frac{3\times4}{8\times15} \\ =\text{ }\frac{1}{10} \end{gathered}[/tex]The number of paint she can use on each wall is 1/10
b) If the number of paints for each wall = 1/10
1 wall = 1/10 paint
let the number of paints for 3/4 = y
1 walls = 1/10 paint
3/4 wall = y
cross multiply:
y(1) = 3/4 (1/10)
y = 3/40
Amount of paint that will be used for 3/4 wall is 3/40