Answer:
About 1.91 pages per minute
Explanations
If a color printer prints 21 pages in 11 minutes, this can be expressed as;
21 pages = 11 minutes
In order to determine the number of pages printed in a minutes, wecan write;
x = 1 minutes
Take the ratio of both expressions to have:
21/x = 11/1
Cross multiply
11x= 21
Divide both sides by 11
11x/11 = 21/11
x = 1.909
x = 1.91
This shows that the color printer prints about 1.91 pages per minute