Percents

A certain metal alloy contains 20% iron, 35% nickel, 35% tungsten and the rest is copper. How many kg of copper are contained in 100.01 kg of the alloy?

Solution: 10.001 kg

Sketch:

The whole alloy is 100%, so "removing" the iron, nickel, and tungsten, the percent copper is 100% - 20% - 35% - 35% = 10%.

Since we know that 10% of the alloy is copper, so .10 * 100.01 = 10.001 kg.

Another Problem Like This One.

Next Try It Out Problem.

Developed by

Shodor
in cooperation with the Department of Chemistry,
The University of North Carolina at Chapel Hill

Another Problem 2

Question:

Solution: 10.001 kg Sketch:

Solution: 10.001 kg

Sketch: