First you need to find the area, the formula is A=LxW, multiply 14 by 11, that’s the area. If one back covers 22 ft we need to find how many 22s are in 154, to do that you divide. Make sense?
Well, if you are asking how to do it, than you would probably first make a book, then on each page write a different math statagy, such as using the factor tree.
The coefficent is 5, since it’s placed before the variable.