The question says to evaluate the cost of four dollars less than the cost of a sweater.
To do this, what we have to do is to create a mathematical equation of it.
Less than always insinuates that we are to subtract, and as such, we are going to subtract four dollars from the cost of the sweater to get our final answer.
Four dollars less than the cost of a sweater that costs $22 is
David can read 50 pages in 50 minutes. (50 pages)/(50 minutes) = 1 page/minute Since David reads 1 page per minute, in 80 minutes David can read 80 pages.
