Question

The cost of white washing the four
wall & the ciling at the rate of Rs
10 per m² is Rs 5000. If the length
breadth of the room are 5m & 4m. find
its height.​

Answer 1

Answer:

80/3m

Step-by-step explanation:

Total expenditure= Rs 5000

Cost per m²= Rs 10

So, Area white washed= total expenditure / cost per m²

= (Rs 5000/Rs10)m²

= 500 m²

Length= 5m

Breadth= 4m

So, [2h(l+b)] + lb= 500m²

[2h(5m+4m)] + 5m*4m = 500m²

2h*9m + 20m² = 500m²

2h*9m = 500m²- 20m²

2h*9m = 480m²

2h = 480m²/9m

h = 480m²/9m / 1/2

h = 80/3m