SOLUTION: An alloy is 70% iron. How much of this alloy do you need if you want to obtain 50 7/20 lb of iron?

Algebra ->  Percentages: Solvers, Trainers, Word Problems and pie charts -> SOLUTION: An alloy is 70% iron. How much of this alloy do you need if you want to obtain 50 7/20 lb of iron?      Log On


   

Question 1060755: An alloy is 70% iron. How much of this alloy do you need if you want to obtain
50 7/20 lb of iron?
Answer by Edwin McCravy(20065) About Me  (Show Source):
You can put this solution on YOUR website!

Let the answer be x pounds.

Then 70% of x lb must equal to 50 7/20 lb

matrix%281%2C5%2C%0D%0A%0D%0A%2270%25%22%2Cof%2Cx%2C%22%22=%22%22%2C50%267%2F20%29 

0.70x%22%22=%22%2250%267%2F20

Change 50%267%2F20 to improper fraction 1007%2F20

0.70x%22%22=%22%221007%2F20

Multiply both sides by 20

14x%22%22=%22%221007

x%22%22=%22%221007%2F14

x%22%22=%22%22matrix%281%2C4%2C71%2613%2F14%2Clb%2Cof%2Calloy%29

Edwin