Question

9. How many bricks number near to next hundred) will be required to build a wall 30 m long
20 cm * 16 cm * 8 cm when one-ninth of the wall is filled with lime?
ctangular water reservoir is 15 m by 12 m at the base wat
30 cm thick and 5 m high with a provision of two doors, each 2.5 m * 12 m, each brick being​

Answer 1

Answer:

Step-by-step explanation:

Total area of wall= 2×(lb+bh+hl)

= 2×(30×0.3+0.3×5+5×30)

= 2×160.5

= 321m²

Area of 2 doors = 2×(l×b)

= 2(1.2×2.5)

= 6 m²

Area of lime filled wall= $\frac{Total area of wall}{9}$

=$\frac{321}{9}$

= 36 m²

Area of bricks=  2×(0.2×0.08+0.08×0.16+0.16×0.2)

Z = Total area of wall (Area of door - Area of lime filled wall)

No. of bricks = $\frac{Z}{Area of brick}$