Answer:The number of books that he had before last week is 28
Step-by-step explanation:
Let x represent the number of books that he had before last week.
Demetrious returned five library books last week. This means that the number of books left is x - 5
He returned three books this week. This means that the amount of books left is x - 5 - 3 = x - 8
He then checked out 8 more books. This means that the amount of books left is x-8-8 = x - 16
He now has 12 library books. This means that
x - 16 = 12
x = 12 + 16 = 28
Multiply by 3 in the first equation and then you can cancel out the +3y and -3y to get the x answer. After that, you can do the same with the y by multiplying -2 in the first equation to cancel out the +2x and the -2x. Do you understand?
40=4×10=200 toys
160=4×40=350 toys
Answer:
I can't fix stupid- sorry-
Step-by-step explanation:
W +Y =5000
20/100 x W= 30/100 X Y
W/5=3Y/10
10W=15Y
W=15Y/10=3Y/2
3Y/2+Y=5000
3Y+2Y=10,000
5Y=10,000
Y=2000
AND HENCE W=3 x2000/2=3000
