A contractor mixes concrete from bags of pre mix for small jobs. How many bags with $8 \%$ cement should he mix with 4 bags of $18 \%$ cement to produce a mix containing $10 \%$ cement?

Question

Quizplus · Accepted Answer

The contractor needs to mix 16 bags of 8% cement with the 4 bags of 18% cement to achieve a 10% cement mix. This can be solved using the method of weighted averages or a simple algebraic equation representing the total amount of cement in the final mix.

A Contractor Mixes Concrete from Bags of Pre Mix for Small