1.

A zinc sheet is of length 3.3 m and breadth 3 m. How many pipes of length 30 cm and radius 3.5 cm can be made from this sheet?

Answer»

Length of zinc sheet = 3.3 m = 330 cm
breadth of zinc sheet = 3m = 300 cm
area of zinc sheet = area of rectangle = length × breath
= 330 × 300 = 99000 cm²
hence, area of zinc sheet = 99000cm²

length of PIPE, h = 30cm
radius of base of pipe , r = 3.5 cm
so, surface area of pipe = 2πrh
= 2 × 22/7 × 3.5 × 30
= 2 × 11 × 30 = 660 cm²

\textbf{\underline{number of pipes}}=\frac{\text{area of zinc sheet}}{\text{surface area of pipe}}

= 99000/660 = 9900/66 = 900/6 = 150

hence, number of pipes = 150


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