Saturday
August 2, 2014

Homework Help: Math

Posted by Kyle on Thursday, August 25, 2011 at 3:10pm.

A contractor requires a cement mix that is 70% sand and 30% cement.
He has 700 kg of a cement mix that is 80% sand and 20% cement.
How much cement should he add so that he gets the required mix?


My set up:

required mix = (S)(.7) + (C)(3)

700kg = (S)(.8) + (C+X)(.2)

Is this even correct?

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Algebra 1 - You are making up your own mix of concrete to patch a set of stairs...
Math,Ratio - mr kim mixes cement&sand to make a mixture.he uses 2 pails of ...
Maths - Sam used cement and sand to prepare a mixture. The ratio of the number ...
algebra - elmer burns works for a ready-mix concrete cmpany. elmer receives an ...
Math - A contractor has been asked to pave 15 miles of new road. Before he can ...
Algebra - A batch of concrete is made by mixing 1 part cement, 2.5 parts sand, ...
math((PLEASE HELP!)) - A contractor has been asked to pave 15 miles of new road...
geometry - Find the weight to the nearest kg, of the cement block. Cement weighs...
5th grade math - bill is replacing the grass in his yard with cement .the yard ...
Math - If a mixture of 24 lb. of cement, 48 lb. of sand, and 63 lb. of gravel is...

Search
Members