Answer
Find out the how many light colors are in the 20 dark colors .
To prove
First find out the number of light colors for one dark color.
As given
In a crayon box there are 5 dark colors for every 8 light colors.
For one dark colour
\(= \frac{8}{5}\ light\ colors\)
Now for the 20 dark colors
\(= \frac{20\times 8 }{5}\)
Solving the above
\(= 4\times 8\)
= 32 light colors
Therefore for 20 dark colors the light colors are 32 .
Hence proved