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### Mathematical Skills | Mensuration

 Q. No. 13: A circular grassy plot of land, 42 in diameter has a path 3.5 m wide running around it on the outside. The cost of gravelling the path at Rs 4 per square meter is A : Rs 1002 B : Rs 2002 C : Rs 3002 D : Rs 1802 Solution
 Q. No. 14: A plot of land in the form of a rectangle has dimension 240m x180m. A drainlet 10m wide is dug all around it (on the outside) and the earth dug out is evenly spread over the plot, increasing its surface level by 25 cm. The depth of the drainlet is A : 1.225 m B : 1.229 m C : 1.227 m D : 1.223 m Solution
 Q. No. 15: An iron pipe 20 cm long has exterior diameter equal to 25 cm. If the thickness of the pipe is 1cm, the whole surface of the pipe is A : 3068 cm2 B : 3268 cm2 C : 3168 cm2 D : 3368 cm2 Solution
 Q. No. 16: A metallic sheet is of rectangular shape with dimensions 48cm x 36cm. From each one of its corners, a square of 8 cm is cut off. An open box is made of the remaining sheet. Find the volume of the box. A : 5110 cm3 B : 5130 cm3 C : 5120 cm3 D : 5140 cm3 Solution
 Q. No. 17: Consider the volumes of the following1). A parallelopiped of length 5cm, breadth 3cm and height 4cm2). A cube having each side 4 cm3). A cylinder of radius 3cm and length 3 cm4). A sphere of radius 3cm.The volumes of these in the decreasing order is A : 1,2,3 and 4 B : 1,3,2 and 4 C : 4,2,3 and 1 D : 4,3,2 and 1 Solution
 Q. No. 18: Four horses are tied on the four corners of a square field of 14 m length so that each horse can just touch the other two horses. They were able to graze in the area accessible to them for 11 days. For how many days is the ungrazed area sufficient for them? A : 3 days B : 4 days C : 5 days D : 2 days Solution
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