Question

Marie has a small copy of rene magritte's famous painting, the schoolmaster. Her copy has dimensions 2 inches by 1.5 inches. The scale of the copy is 1 in :40 cm. Find the dimensions of the original painting

Answer 1

We just multiply the scale to the dimensions
2 in to original is: 2×40= 80 cm
or do proportions:
$\frac{2}{x}$=$\frac{1}{40}$
=$\frac{2*40}{1}$=x
=80 cm=x the original dimension.
Same thing to the other side.
1.5×40=60 cm
or proportions again:
$\frac{1.5}{y}$=$\frac{1}{40}$
$\frac{1.5*40}{1}$=y
60 cm=y 
60 cm is the original dimension
80 cm times 60 cm ORIGINAL DIMENSION