•A farmer has a rectangular field of length 30 m and breadth 15 m. By the farmer a pit of diameter 7 m is dug 12 m deep for rain water harvesting. The earth taken out is spread in the field•
(32) The area of the rectangular field is:
(A) 420 m2 (B) 430 m2 (C) 440 m2 (D) 450 m2
(33) Find the area of the top of the pit.
(A) 38.5 m2 (B) 40.5 m2 (C) 41.5 m2 (D) None of these
(34) The area of the remaining field is
(A) 402.3 m2 (B) 405 m2 (C) 410 m2 (D) 411.5 m2
(35) Find the cost of spreading the mud on the remaining field if the cost of spreading mud is Rs 10 per m²
(A) Rs 4023
(B) Rs 4050
(C) Rs 4100
(D) Rs 4115
Answers
The answer will be : option a,b,c,a
This is answer of all the questions.
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Step-by-step explanation:
Given :
A farmer has a rectangular field of length 30 m and breadth 15 m. By the farmer a pit of diameter 7 m is dug 12 m deep for rain water harvesting. The earth taken out is spread in the field.
To find: Based on the above information, answer the following questions.
Solution:
(32) The area of the rectangular field is
(A) 420 m² (B) 430 m² (C) 440 m² (D) 450 m²
Ans: Area of Rectangle= length×breadth
Length of field= 30 m
Breadth of field =15 m
Option d is correct.
(33) Find the area of the top of the pit.
(A) 38.5 m² (B) 40.5 m² (C) 41.5 m² (D) None of these
Ans: Area of top of cylinder is a circle.
Thus,
Area of top of pit is a circle of radius 3.5 m
Option A is correct.
(34) The area of the remaining field is
(A) 402.3 m² (B) 405 m² (C) 410 m² (D) 411.5 m²
Sol: To find Area of remaining field; Subtract area of top of pit from area of cylinder.
Area of the remaining field=
Option d is correct.
(35) Find the cost of spreading the mud on the remaining field if the cost of spreading mud is Rs 10 per m²
(A) Rs 4023
(B) Rs 4050
(C) Rs 4100
(D) Rs 4115
Sol: Mud is spreading on the remaining area,i.e 411.5 m²
Cost of spreading mud is 10 per m²
Cost of spreading mud in 411.5× 10 = 4115 Rs
Option d is correct.
Final answer:
32) Option d is correct.
33) Option a is correct.
34) Option d is correct.
35) Option d is correct.
Hope it helps you.
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