Question

A Brick wall measure 20ft by 6ft. by 1ft. and is made out of bricks that measure 8' by 4' by 2'. If 10 percent of the wall is mortor, find the number of brcks needed

Answer 1

Volume of bricks = 90% of (20×6×1)
Number of bricks = volume of bricks ÷ (8×4×2)

(Though, I'm wondering how they stack bricks that are 2ft thick and make a wall that is only 1 foot thick... ?? Perhaps they cut the bricks in half)

Answer 2

There may be a typo, and the bricks actually measure 8'' by 4'' by 2'' . . .
In which case, convert inches to feet or vice-versa.

Answer 3

oh oop sorry. it says 20 ft by 6 ft by 1 ft for the wall and 8" by 4" by 2" for the bricks

Answer 4

OK, same strategy, but like I said, convert all inches to feet or all feet to inches before you start to keep your units consistent.
e.g. you can take the (20×6×1) and multiply by (12×12×12) to convert that to cubic inches.

Answer 5

3240?

Answer 6

90% =2916! got it thanks!