Tuesday

July 22, 2014

July 22, 2014

Posted by **Zayn** on Sunday, September 30, 2012 at 7:03am.

A.) How many pails of cement was used at first?

B.) How many pails of sand was used?

- Maths -
**Reiny**, Sunday, September 30, 2012 at 8:45amoriginal amount of cement = x

original amount of sand = 2x

new amount of cement = x + 8

new amount of sand = 2x

(x+8)/(2x) = 5/2

cross-multiply

10x = 2x + 16

8x = 16

x = 2

A) original amount of cement = 2 pails

B) original amount of sand = 4

check:

new amount of cement = 2+8=10

new amount of sand = 4

10: 4 = 5:2

**Related Questions**

Math,Ratio - mr kim mixes cement&sand to make a mixture.he uses 2 pails of ...

Math - A contractor requires a cement mix that is 70% sand and 30% cement. He ...

social studies - What is a mixture of sand, lime, and water that is used as a ...

Algebra - A batch of concrete is made by mixing 1 part cement, 2.5 parts sand, ...

Algebra 1 - You are making up your own mix of concrete to patch a set of stairs...

algebra - elmer burns works for a ready-mix concrete cmpany. elmer receives an ...

Math - If a mixture of 24 lb. of cement, 48 lb. of sand, and 63 lb. of gravel is...

Math - If a mixture of 24 lb. of cement, 48 lb. of sand, and 63 lb. of gravel is...

chemistry - a student tried to separate a mixture of sand and red-colored water ...

Algebra - Concrete forming tubes are used as molds for cylindrical concrete ...