Acarpenter goes through 2 3/5 boxes of nails finishing 3 1/2 rooves. how much would he use finishing 8 roves?

Find the unit rate first, and then multiply it by 8:

2 3/5 boxes
= 13/5 divided by 7/2.
3 1/2 roofs

You can obtain the correct result by inverting the divisor, 7/2, and then multiplying:

13/5 times 2/7.   This comes out to 26/35.  That represents 26/35 box of nails per roof.

To do 8 roofs (not roves), you'd need (26/35)(8/1) boxes:  5.94 boxes.  Why not buy 6 boxes to be sure you'll have enough?

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!