Question

5 green balls and 2 red balls together weigh 10 pounds, and 1 green ball and 4 red balls together weigh 7 pounds. If all red balls weigh the same amount and all green balls weigh the same, then what is the weight of 8 red and 8 green balls together? 5 green balls and 2 red balls together weigh 10 pounds, and 1 green ball and 4 red balls together weigh 7 pounds. If all red balls weigh the same amount and all green balls weigh the same, then what is the weight of 8 red and 8 green balls together? @Mathematics

Answer 1

Let green ball's weight be x
Let red ball's weight be y
5x + 2y = 10
x + 4y = 7

5x + 2y = 10
10x +4y = 20
- x +4y =7
9x = 13
x =13/9
y = 50/36
8 (13/9 + 50/36)
= 68/3

Answer 2

I got something like 22.666...

Answer 3

same 68/3 = 22.666...