Question

13. The length, breadth and thickness of a rectangular log of wood are 8 m, 1.5 m and 75 cm respectively. Find the cost of the log at the rate of 1.25 per 1000 cubic centimetre.​

Answer 1

Answer:

see the above slide

Step-by-step explanation:

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Answer 2

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It is given that, length (l) of box = 1.5 m

Breadth (b) of box = 1.25 m

Depth (h) of box = 0.65 m

(i) Box is to be open at top.

Area of sheet required

= 2lh + 2bh + lb

= [2 × 1.5 × 0.65 + 2 × 1.25 × 0.65 + 1.5 × 1.25] m2

= (1.95 + 1.625 + 1.875) m2 = 5.45 m2

(ii) Cost of sheet per m2 area = Rs 20

Cost of sheet of 5.45 m2 area = Rs (5.45 × 20)

= Rs 109