SOLUTION: 1. The sum of two numbers divided by 4 equal to 10. The difference between them multiplied by 3 equal to 18 2. Half the sum of two numbers is 20 and twice their difference is 8.

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Question 1134063: 1. The sum of two numbers divided by 4 equal to 10. The difference between them multiplied by 3 equal to 18
2. Half the sum of two numbers is 20 and twice their difference is 8.
3. A building contractor buys 5 doors and 6 windows and pays R659 for it. A while later he buys 7 doors and 4 windows more and pays R641. What did he pay per window and per door
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
x and y
(x+y)/4=10, so x+y=40
(x-y)*3=18
x-y=6
add the two
2x=46
x=23
y=17
------------------------------------
the whole sum=40 so x+y=40
2(x-y)=8 so x-y=4
add them
2x=44
x=22
y=18
-----------------------------------
5D+6W=659
7D+4W=641
multiply top by 2 and bottom by -3 to eliminate W
10D+12W=1318
-21D-12W=-1923
-11D=-605
D=55
W=64