Math
posted by Leo on .
You plan to construct a brick wall measuring 4.5 m in length, 1.2 m high, and 0.5 m in width. If a brick measures 20 cm x 9 cm x 5 cm, how many bricks will you need?
Total volume (to the nearest tenth) = ________ cubic meters. The number of bricks =_________ .

First find the volume of the wall.
V = LWH
Find the volume of each brick.
Then convert that to cubic centimeters.
1 cubic meter = 1 000 000 cubic centimeters 
volume of wall is 2.7
vol of each brick= 900
900,000,000
Is that how many bricks? Sounds like alot. Am I missing a step 
Right  the volume of the wall is 2.7 cubic meters = 2,700,000 cubic centimeters
Each brick's volume is 900 cubic centimeters.
Here's your mistake. You need to divide, not multiply.
2,700,000 / 900 = 3,000 bricks 
got it. thanks again

:) You're welcome.

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