A hardware store has 200 paintbrushes. They order 9 boxes with 12 paintbrushes each. They sell 11 boxes that have 6 paintbrushes
each. The store manager says they now have about 260 paintbrushes. Is the manager's estimate reasonable? The manager's estimate is reasonable. They ordered about 120 paintbrushes and sold about 60 of them so they should have about 60 more paintbrushes than they started with. The manager's estimate is not reasonable. They ordered about 60 paintbrushes and sold about 120 of them so they should have about 60 fewer paintbrushes than they started with. The manager's estimate is not reasonable. They ordered about 120 paintbrushes and sold about 110 of them so they should have about 10 more paintbrushes than they started with. The manager's estimate is reasonable. They ordered about 120 paintbrushes and sold about 110 of them so they should have about the same number of paintbrushes that they started with.
The hardware store has 200 paintbrushes. They order 9 boxes with 12 paintbrushes each. This means that the total number of paintbrushes that was ordered is
12 × 9 = 108
Therefore, the total number of paintbrushes that the store has would be
200 + 108 = 308
They sell 11 boxes that have 6 paintbrushes each. This means that the total number of paintbrushes that they sold is
11 × 6 = 66
Therefore, the number of paintbrushes left would be
308 - 66 = 242
The manager's estimate is reasonable. They ordered about 120 paintbrushes and sold about 60 of them so they should have about 60 more paintbrushes than they started with.
