SOLUTION: A customer desires to mix her own concrete. The clerk knows that the ratio of cement to sand to gravel is 1:3:4. If the customer needs 1,000 pounds of dry mix, how many pounds of

Algebra ->  Proportions  -> Lessons -> SOLUTION: A customer desires to mix her own concrete. The clerk knows that the ratio of cement to sand to gravel is 1:3:4. If the customer needs 1,000 pounds of dry mix, how many pounds of      Log On


   

Question 231691: A customer desires to mix her own concrete. The clerk knows that the ratio of cement to sand to gravel is 1:3:4. If the customer needs 1,000 pounds of dry mix, how many pounds of each ingredient should she use?
Please use cross products
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
The direct way to solve this problem is to add the three ratios:
1+3+4=8
Now find how many sets of 8 there are in the total of 1,000.
1,000/8=125 for each 1 of the elements in the ratio.
1*125=125 pds. of cement.
3*125=375 pds. of sand.
4*125=500 pds. of gravel.
Proof:
125+375+500=1,000
1,000=1,000