To make any meaningful calculations here, you'll have to think about how the area of each room is calculated, as well as to invent how much per square yard the various types of carpeting cost.
Note that the cost of carpeting one room would be (room area)(carpet cost per square foot).
A)
10.00 - 3.55 = 6.45 back
a $5 bill and a $1 dollar bill = $6
a quarter and 2 dimes = 0.45
so 2 bills and 3 coins
B) 120 x 4 = 480 minutes
480/60 = 8 hours
You divide both sides by 5 and then 2, leaving you with what the sum of x and y is.
Probably 3 5/9 around that I’m pretty sure