Question

An open water tank 12 m long 9 m wide and 4 m deep is to be made. Determine the cost of iron sheet required at the rate of Rs.105 per m,if the sheet is 2m wide.

Answer 1

length = 12m  ;  breadth = 9m ;  height = 4m

TSA of the tank = 2[length×breadth + breadth×height + height×length] = 2[12×9+9×4+4×12]

 = 384 m2

Area of the rectangular iron sheet = 384 m2

so, length × breadth = 384 ⇒ length = 384 / 2 = 192 m  [as sheet is 2 m wide]

Now total cost of the sheet = Rs. (192 × 50) = Rs. 9600

Answer 2

Step-by-step explanation:

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93/1395 = 105/x

By cross-multiplying

93x = 105(1395)

93x = 146475

x = 146475/93

= 1575

∴ The cost of 105m plastic sheet is Rs 1575

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