Four cubes of edge 5 cm each are placed side by side and stuck together . If the outer surface alone is painted at Rs 300 per meter square , find the cost of painting

Asked by deepikankur | 17th Mar, 2018, 06:55: PM

Expert Answer:

begin mathsize 16px style According space to space the space question space if space 4 space cubes space of space 5 space cm space are space joined
then space length space of space cuboid space is space 5 cross times 4 equals 20 space cm space equals straight l
breadth equals 5 space cm equals straight b space and space height equals 5 space cm equals straight h
Total space surface space area space of space cuboid equals 2 open parentheses lb plus bh plus hl close parentheses
equals 2 open parentheses 20 cross times 5 plus 20 cross times 5 plus 5 cross times 5 close parentheses
equals 450 space cm squared
The space cost space of space painting space 1 space sq. space straight m equals Rs. space 300
The space cost space of space painting space the space cuboid equals 450 cross times 300
equals Rs. space 135000
end style

Answered by Sneha shidid | 19th Mar, 2018, 11:06: AM