Question
The ratio of the length to breadth of a rectangular
playground is 7:5. If the cost of fencing the playground at the rate of Rs. 4 per metre is Rs. 1920, then find the area of the playground.Solution
ATQ,
Let the length and breadth of the playground be 7x metres and 5x metres respectively.
According to the question,
2(7x + 5x) = 1920 / 4
⇒ 2(12x) = 480
⇒ 24x = 480
⇒ x = 20 metres
Therefore, area of the playground = 7x × 5x = 35x² = 35 × 400 = 14000 m²
The average marks obtained by a student in a certain number of tests is 36. His average increases by 2 when he scores 90 in his next test. Find the tota...
Sonali applied for a job of Science teacher in a school. In the test for job, she scored 8 in Physics, 8 in Chemistry, 6 in Biology, and 6.5 in the inte...
In an examination, the average marks obtained by the students is 40. After correcting the quantitative mistakes, the average of 50 students is reduced t...
The average age of 32 children and their teacher's age are 28 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?
The average number of balloons distributed among five kids is 9. If each kid received 1 balloon more than the kid before, then find the highest number o...
The average price of two laptops, namely 'D' and 'E' is Rs. 65,500 whereas the average price of laptops 'E' and 'F' is Rs. 70,000. If the average price ...
A college group of 50 students has an average age of 23 years. 10 new students are added and the average age decreases to 21. What is the average age of...
- The average of three numbers is 60. When three more numbers are included, the average increases by 6. Find the average of the numbers included.
The average weight of 8 persons is increased by 2.5 kg, when a person whose weight is 56 kg, is replaced by a new comer. Find the weight of new comer?
The average of the first six numbers is four times the average of the next three numbers. If the average of all nine numbers is 24, then find the sum of...
Relevant for Exams:
