Les is sending 8 identical catalogs to one of his customers. If the package with the catalogs weighs 6.96 pounds, how much does each catalog weigh?

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.

the real mean is 6.88, so you can round that up to seven.

3x = 90°

x = 30°   divided both sides by 3

2x + 3y = 90°

2(30°) + 3y = 90°     substituted x with 30°

60° + 3y = 90°         simplified (multiplied 2 and 30°)

        3y = 30°         subtracted 60° from both sides

          y = 10°         divided both sides by 3

answer: y = 10°