Q23 of 24 Page 236

The dimensions of an oil tin are 26 cm, 26 cm and 45 cm. Find the area of the tin sheet required for making 20 such tins. If 1 m2 of the tin sheet costs Rs. 10, find the cost of tin used for these 20 tins.

Given,


length (l) = 26 cm


breadth (b) = 26 cm


height (h) = 45 cm


Area of tin = total surface are of cube


= 2(lb +bh + hl)


= 2[(26)(26) + (26)(45) + (45)(26)]


= 2[676 + 1170 + 1170]


= 2 × 3016


= 6032cm2


Area for 20 tins = 20 × 6032cm2


= 120,640 cm2


= 12.0640 m2


Cost of tin = Rs. 10 per m2


⇒ cost of 20 tins = 12.0640 × 10


= Rs 120.640


So, cost of such 20 tins is Rs 120.640


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