Question
The perimeter of a square field is 10 cm more than the
perimeter of a rectangle. The length of the rectangle is 60 cm which is 80% of its width. If a street of width 10 cm surrounds from outside the square, then find the total cost of constructing the street at the rate of Rs. 20 per sq. cm.Solution
Let the width of the rectangle = x cm Then, 80% of x = 60 x = 60 × 100/80 = 75 cm Perimeter of the rectangle = 2 (length + width) = 2 × (60 + 75) = 270 cm Perimeter of the square = (270 + 10) = 280 cm The sides of the square = 280/4 = 70 cm The area of the square field without street = (70)2 sq. cm = 4900 sq. cm The area of the square field with street = (70 + 20)2 sq. cm = 8100 sq. cm The area of the street = 8100 – 4900 = 3200 sq. cm The total cost of constructing the street = 3200 × 20 = Rs. 64000
- Which of the following statement is/are incorrect about the “Aravali Range”? - I. The shape of the Aravali range is... 
- The very famous Thomas Alva Edison, inventor of the incandescent light bulb, the phonograph, and the motion picture camera belongs to which country? 
- The Constitution (101st Amendment) Act, 2016, _______deals with: 
- "One's knowledge depends on how much he learns" - What is the simile that Thiruvalluvar uses in this meaning? 
- Select the misspelled word. 
- India’s total area accounts for about ___of the total geographical area of the world. 
- Which of the following schemes of the Government of India deals with the promotion of organic farming? 
- What is the boiling point of water at sea level?
- What was the immediate outcome of the conference of ambassadors of European states, which was chaired by - Duke Metternich? 
- In which year was the All India Kisan Sabha, a peasant organisation, founded?