If 8 jump ropes and 4 dolls cost $64, and 4 jump ropes and 8 dolls cost $92, how much will 12 jump ropes and 12 dolls cost?

Answer 1

8 j + 4 d = 64
4 j + 8 d = 92

multiply first eqn by 2
16 j + 8 d = 128
4 j + 8 d = 92
--------------- subtract
12 j = 36
j - 3 dollars per jump rope
then
d = 10 dollars per doll

You can do it now

Answer 2

What, I don't get. Why does that equal 12 jumping ropes instead of dolls?

Answer 3

thanks damon

Answer 4

thanks a lot it really helped my son

Answer 5

Thanks a lot it was great!

Answer 6

what i dont get it