find the number of bricks, each measuring 25 cm x 16 cm x 10 cm required to construct a wall 24 m long, 6 m high and 0.4 m thick. the mortar occupies (1/10)th of the volume of the wall

V = 25 * 16 * 10

V = 4,000

0.9 * 4,000 = 3,600 cubic meters

0.25 * 0.16 * 0.1 = 0.004 cubic meters for each brick

3600 / 0.004 = 900,000 bricks

2000

To find the number of bricks required to construct the wall, we need to calculate the total volume of the wall first.

1. Calculate the volume of the wall:
The wall has a length of 24 meters, a height of 6 meters, and a thickness of 0.4 meters. Since the wall is rectangular, its volume can be calculated by multiplying these dimensions:
Volume of the wall = length × height × thickness
Volume of the wall = 24 m × 6 m × 0.4 m

2. Calculate the volume occupied by the mortar:
It is given that the mortar occupies (1/10)th of the volume of the wall. So we need to subtract this amount from the total volume calculated in step 1:
Volume of the mortar = (1/10) × Volume of the wall

3. Calculate the volume remaining for the bricks:
Volume remaining for the bricks = Volume of the wall - Volume of the mortar

4. Calculate the volume of each brick:
Each brick has dimensions of 25 cm × 16 cm × 10 cm. However, the dimensions need to be converted to meters to match the unit of the wall:
25 cm = 0.25 m
16 cm = 0.16 m
10 cm = 0.10 m
Volume of each brick = 0.25 m × 0.16 m × 0.10 m

5. Calculate the number of bricks required:
Divide the volume remaining for the bricks (from step 3) by the volume of each brick (from step 4) to get the total number of bricks required:
Number of bricks = Volume remaining for the bricks / Volume of each brick

Now you can substitute the values into the above formulas to find the answer.