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Area

Q1: A tank is 25 m long, 12 m wide and 6 m deep. The cost of plastering its walls and bottom at 75 paise per sq. m, is:

A Rs. 456

B Rs. 458

C Rs. 558

D Rs. 568

ANS:C - Rs. 558

Area to be plastered = [2(l + b) x h] + (l x b)
  = {[2(25 + 12) x 6] + (25 x 12)} m2
  = (444 + 300) m2
  = 744 m2.
 Cost of plastering = Rs. 744 x 75 = Rs. 558.
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