Question

A wall measuring 10m×1.62m×28cm is to be built by using bricks each measuring 21cm×9cm×6cm. how many bricks will be needed assuming no wastage in the process? find also the cost of the bricks at rupees 1.50 per piece. ​

Answer 1

4000 bricks will be needed and cost of the bricks is Rs. 6000.

Step-by-step explanation:

Let length of the wall = L =  10 m = 10 x 100 cm = 1000 cm

Width of the wall = W = 1.62 m = 1.62 x 100 cm = 162 cm

height of the wall = H = 28 cm

Volume of the wall = LWH = 1000 x 162 x 28 = 4536000 cm³

Volume of the bricks = 21 cm x 9 cm x 6 cm = 1134 cm³

Number of bricks needed = $\frac{4536000}{1134}$ = 4000.

Cost of 1 brick = Rs. 1.50

Cost of 4000 bricks = Rs. 4000 x 1.50 = Rs. 6000

Hence, 4000 bricks will be needed and cost of the bricks is Rs. 6000.

Answer 2

Answer:

$ 6000

Step-by-step explanation:

Wall measuring 10m ˣ 1.62m ˣ 28cm

                     =    10m in Cm = 10 ˣ 100

                     =    1000cm

                     

                     =   1.62m in Cm = 1.62 ˣ 100

                     =   162cm ˣ  

Volume of wall = L ˣ B ˣ H

                         = 1000 ˣ 162 ˣ 28

                         = 4536000 $cm^3$

Volume of bricks = 21 ˣ 9 ˣ 6

                            = 1134 $cm^3$

          = $\frac{4536000}{1134}$    

          =  4000 $cm^3$

             

Rate of per piece of bricks = ₹ 1.50

                                            = 4000 ˣ 1.50

                                            = ₹ 6000