Question
The number of trees in a park increases by 12% every
year. If the number of trees after 2 years will be 3,136, find the current number of trees in the park.Solution
ATQ,
Let, the present number of trees be ‘x’.
ATQ,
So, the number of trees after 2 years = 1.12 × 1.12 × x = 3136
Or, x = 3136 × (1/1.12) × (1/1.12)
So, x = 2,500
Therefore, the current number of trees in the park = x = 2,500
The average cost of 3 chairs is Rs. 9500. The average cost decrease by 15% when one more chair is included. What is the cost price of the 4th...
Average weight of all the people in a group is 58 kg. When two people of weight 65 kg and 81 kg left the group, average weight reduces by 1.2 kg. Find t...
The average mark obtained by 110 candidates in a certain examination is 45. If the average marks of passed candidates are 50 and that of the failed cand...
In a family of 10, the men eat on average 65 kg of food and women eat on an average 45 kg of food. The men and women are equal in number. A woman...
The average salary of 35 employees in a company was calculated to be ₹42,000. Later it was found that ₹45,000 was entered as ₹54,000, and ₹39,00...
Sum of ages of 80 people is 1600 years. The average age of 30 of them is 18 years and average age of another 30 of them is 14 years. Find the average a...
The average salary of 25 Japanese employees in a company is Rs.50,000 per month. If the salary of the manager is included, the average salary increases ...
- The average of 7 data points is 60. If two additional data points with average 'x' are included, the overall average increases by 15%. What is the value of...
In a family of 10, the men eat on average 70kg of food and women eat on an average 45kg of food. The men and women are equal in number. A woman j...
Priya spends an average of Rs. 600 on Sundays and Rs. 450 on the remaining days. Find her average spending in a 30-day month starting with Sunday.
Relevant for Exams:
