Joe makes belts. He has 9 buckles. He uses 12 rivets on each of 4 belts and 15 rivets on each of 2 belts. He has 22 rivets left over. How many rivets are on the belts? Identify any extra information given in the problem.

Answers:

1. There are rivets on the belts.

2. Extra information given in the problem:

a. He has 9 buckles.

b. He has 22 rivets left over.

Solution:

1. Total rivets on the belts = (12 rivets/belt) (4 belts) + (15 rivets/belt) (2 belts)

Total rivets on the belts=48 rivets+30 rivets

Total rivets on the belts=78 rivets

2. The extra information given in the problem is the information that we didn't use to solve it. In this case:

a. He has 9 buckles.

b. He has 22 rivets left over.