Asked by arjun

To construct a wall 18 m long, 0.5 m thick and 9 m high, bricks of dimensions 20 cm *15*10 cm each are used. if the mortar occupies1/10th of the volume of the wall,then find the number bricks used.

Answers

Answered by oobleck
The easy way is just to divide 9/10 of the volume of the wall by the volume of a brick. So, that would be (using cm for all dimensions)
(0.9 * 1800 * 900 * 50)/(20*15*10) = 24,300

Or, since 10% of the thickness of the wall is 45cm = 3 bricks thick (with mortar), you can divide 90% of the area by the area of a brick, and multiply by 3:
3*(0.9 * 1800 * 900)/(20*10) = 21,870

Why do the two answers differ? Is either one correct?

Of course, this assumes no bricks have to be cut to fit the dimensions of the wall ...
There are no AI answers yet. The ability to request AI answers is coming soon!

Related Questions