How many pounds of nails costing $7 per pound must be mixed with 6 pounds of nails costing $3 per pound to yield a mixture costi

Question

Leona [35]

3 years ago

15

How many pounds of nails costing $7 per pound must be mixed with 6 pounds of nails costing $3 per pound to yield a mixture costi

ng $4 per pound?

Mathematics

1 answer:

Yuliya22 [10] · Answer 1 · 2022-06-11T08:17:32+03:00

Yuliya22 [10]3 years ago

6 0

Let nails 7/pound=N1
nails 3/pound=N2

let N1=x
N2=6
then total=x+6
7x+6*3=(x+6)*4
7x+18=4x+24
3x=6
x=2
so 2 pounds on Nails costing 7/pound must be added