# Algebra

posted by .

A batch of concrete is made by mixing 1 part cement, 2.5 parts sand, and 3.5 parts gravel. How many pounds of sand and gravel are needed to make 300 pounds of cement?

• Algebra -

2.5/7 = x/300 for sand

3.5/7 = x/300 for gravel

In each case, solve for x.

• Algebra -

I figured it out, and actually you multiply the 2.5 by 300 and then the 3.5 by 300 to get the amount of sand and gravel!!

• Algebra -

2.5x300=750. 3.5x300=1,050

## Similar Questions

1. ### algebra

elmer burns works for a ready-mix concrete cmpany. elmer receives an order for 3.5 cubic yards of concrete. this mixture of concrete contains sand, cement, gravel, and water, for each pound of water, there are 5 lb of sand, 2 lb of …
2. ### algebra

in a mixture if concrete, there are four lb of cement mix for each pound of gravel. if the the mixture contains a total of 195 lb of these two ingredients, how many pounds of gravel are there?
3. ### Math

If a mixture of 24 lb. of cement, 48 lb. of sand, and 63 lb. of gravel is needed to make 1 cubic foot of concrete, how many pounds of sand are needed to pour a pool deck of 156 cubic feet?
4. ### Algebra 1

You are making up your own mix of concrete to patch a set of stairs. In order to have the proper mix, you need to mix 1 part of Portland cement with 2 parts of sand and 3 parts of gravel. A. How many total parts are in one batch of …
5. ### Math

If a mixture of 24 lb. of cement, 48 lb. of sand, and 63 lb. of gravel is needed to make 1 cubic foot of concrete, how many pounds of sand are needed to pour a pool deck of 156 cubic feet?
6. ### Math

Mr Kim mix cement and sand to make a mixture.He uses 2 pails of cement for every 5 pails of sand. (A) Find the ratio of the number of pails of cement to the number of pails of sand. (B) If he uses 24 pails of cement,how many pails …
7. ### math

Concrete is made by mixing cement and sand in the ratio 3:1:15 how much sand would be needed to make 125 tonnes of concrete
8. ### Math

concrete is to be mixed using cement and sand into the ratio 2:5. how much sand will be required to mix with 96 pounds of cement?
9. ### Maths

Matilda is looking at making a concrete mix. She mixes 2 parts of cement powder to every 7 parts of sand. Cement costs 35 cents a kilogram and sand costs 20 cents a kilogram. In total she spent \$180. What was the total weight of cement …