the length, breath and height of a room are 5 m ,4m and 3m respectively.find the cost of white washing the walls of the room and the ceiling at the rate of RS 7.50per m²
Answers
Answered by
3
Answer:
RS. 555
Step-by-step explanation:
NOTE :
- Total Surface Area of Cuboid= 2(lb + bh +lh)
- Area of the rectangle = l*b
SOLUTION
Total area painted will be = Area of cuboid - area of rectangle
( Note : it is considered as the land is not painted and hence it is subtracted )
Area of cuboid = 2(lb + bh +lh)
= 2 ( 5*4 + 4*3 + 3*5 )
= 2 ( 20 + 12 + 15 )
= 2 ( 47 )
= 94 m^2
Area of the rectangle = l*b
= 5*4
= 20
Total area painted = 94 - 20 = 74
TOTAL COST = Area painted * cost
Total cost = 74 * 7.50 = RS. 555
Answered by
1
Answer:
The weighing machine measures this apparent weight and hence the mass indicated by it is less than the actual mass. Our actual mass will be more than 42 kg.
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