Question

The length, breadth height of a room are 5 cm 4 cm 3 cm find the cost of white washing the walls of the room and ceiling at the rate of Rs.7.50 per metre square

Answer 1

since the dimensions are too small so I think the rate ofwhitewashing is 7.50 per centimeter square .

solution:
________

lengthe = 5cm, breadth = 4cm, height
= 3cm

area of walls = 2(l + b ) × h

= 2 ( 5 + 4) × 3 = 54 cm^2

area of ceiling = length × breadth

= 5 × 4 = 20 cm^2

total area of room to be whitewashed
= area of walls + area of ceiling

= 54 + 20 = 74cm^2

cost of whitewashing 1cm^2 = ₹7.50


cost of whitewashing (74cm^2) the walls and ceiling of the room


= 7.50 × 74 = ₹555


Answer: cost = ₹555
____________________

Answer 2

• Answer:

Area= 2 h ( l+b) + L×b

= 2×3(5+4) + 5×4

= 6(9)+20

= 54+20

= 74 m 2

cost = area × rate

= 74 m× 7.50

= 555 ripped .

i hope im help u .....