Papa is putting new concrete on a driveway. The driveway is 30' x 10' x 9" thick. Concrete is measured by the cubic yard. One sack of dry cement mix costs $7.30, and it takes four sacks to mix up 1 cubic yard of concrete. How much will it cost?
Papa is putting new concrete on a driveway. The driveway is 30' x 10' x 9" thick. Concrete (a mixture of sand, gravel, and cement) is measured by the cubic yard. One sack of dry cement mix costs $7.30, and it takes four sacks to mix up 1 cubic yard of concrete. How much will it cost Mike to buy the cement?
Papa is putting new concrete on a driveway. The driveway is 30' x 10' x 9" thick. Concrete (a mixture of sand, gravel, and cement) is measured by the cubic yard. One sack of dry cement mix costs $7.30, and it takes four sacks to mix up 1 cubic yard of concrete. How much will it cost Mike to buy the cement?
1 Answer
Assuming you can't buy one third of a sack of cement, it will cost $248.20
Explanation:
Since we are dealing with cubic yards let's convert our driveway measurements from feet to yards and inches to yards.
Remember
So instead of
We get:
Multiplying these together we need:
If we multiply the amount we need by 4 we get how many sacks of dry cement are required:
However you probably can't buy one third of a sack so round it up to 34 sacks.
Since each sack costs $7.30 we multiply the number of sacks by 7.3:
