Question

A wooden box of size 30cm×15cm×4cm is to be covered with a paper. find the length of paper requires,if the sheets of paper is 12cm wide. also, find the cost of paper at₹4 per 20 cm

Answer 1

Answer:

Length of paper required = 105cm

cost of paper = ₹21

explanation : -

surface area of wooden box = 2 x (30x15 + 15x4 + 30x4) = 2 x (450 + 60 + 120)

=> 1260 cm²

given that width of paper = 12cm

Let the length of paper be L

area of paper required = L x 12 cm²

∴ L x 12 = 1260

=> L = 105cm

20cm of paper cost = ₹4

105cm of paper cost = 4/20 x 105 = ₹21