Question

Paper plates come in packages of 15 or 20. George bought 10 packages and had a total of 170 plates. How many of each package did he buy?

3 packages of 15, 7 packages of 20
7 packages of 15, 3 packages of 20
4 packages of 15, 6 packages of 20
6 packages of 15, 4 packages of 20

Answer 1

Let x = number of 15-plate packages bought, then the number of 20-plate packages = 10 - x. The equation to find x would be\[15x+20(10-x)=170\] Solve for x.

Answer 2

x = 1?

Answer 3

No. \[15x+200-20x=170\]What is x?

Answer 4

x = 6

Answer 5

is it D?

Answer 6

Yes, x=6. Sorry. I was helping someone else.

Answer 7

so it was D right?

Answer 8

or C?

Answer 9

you can model this situation by solving the system:
let x = # 15plate pkg
let y = # 20 plate pkg

x+y=10
15x + 20y = 170

best way i think is to just check against your choices..

Answer 10

I defined x above. You got x=6 for an answer. So which is correct C or D?