eukrasicx

2022-09-01

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?

Frida King

Beginner2022-09-02Added 8 answers

Since we are dealing with cubic yards let's convert our driveway measurements from feet to yards and inches to yards.

Remember 36 inches = 1 yard and 3 feet = 1 yard

So instead of 30 feet $\times$ 10 feet $\times$ 9 inches

We get: 10 yards $\times$ $\frac{10}{3}$ yards $\times$ $\frac{1}{4}$ yards

Multiplying these together we need: $\frac{25}{3}=8.\overline{3}$ cubic yards

If we multiply the amount we need by 4 we get how many sacks of dry cement are required:

$\frac{25}{3}\cdot 4=\frac{100}{3}=33.\overline{3}$ sacks

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:

$34\cdot 7.3=248.2$ which as a cash value equals $248.20.

Remember 36 inches = 1 yard and 3 feet = 1 yard

So instead of 30 feet $\times$ 10 feet $\times$ 9 inches

We get: 10 yards $\times$ $\frac{10}{3}$ yards $\times$ $\frac{1}{4}$ yards

Multiplying these together we need: $\frac{25}{3}=8.\overline{3}$ cubic yards

If we multiply the amount we need by 4 we get how many sacks of dry cement are required:

$\frac{25}{3}\cdot 4=\frac{100}{3}=33.\overline{3}$ sacks

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:

$34\cdot 7.3=248.2$ which as a cash value equals $248.20.

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