For the following questions answer them individually
The average age of 3 girls is 24 years and their ages are in the proportion of 7 : 8 : 9. What is the age of the eldest girl?
Find the sum of money which must be invested at simple interest for 8 months at 6% per annum in order to earn ₹250 as interest.
The cash difference between the selling prices of an article at a profit of 8% and at a loss of 4% is ₹54. Find the cost price of the article.
A certain number of identical spheres are formed by melting a large sphere of radius 28 cm. What is the number of small spheres formed if the surface area of each small sphere is 2464 cm$$^2$$? [Use $$\pi = \frac{22}{7}$$]
The marked price of a laptop is ₹65,000. The laptop is sold at a discount of 20%. If a profit of 30% is made through the sale, then what is the cost price of the laptop?
The following bar chart shows the number of computers sold by a shop in 6 consecutive months.
What is the average number of computers sold per month during this period? [Round off your answer to the nearest integer value.]
In a city 60% of the population are males and the rest are females. If the ratio of married males to non-married males is 5 : 7, and the ratio of married females to non-married females is 2: 3, then what percentage of the total population is married?
The simple interest on a sum of money invested for a period of 10 years is equal to $$\frac{4}{5}$$th of the sum invested. What is the rate of simple interest per annum that is being given?
$$A_1$$ alone can complete a piece of work in 14 days, $$A_2$$ alone can complete the same work in 21 days, while $$A_3$$ alone can complete the same work in 28 days. The three worked together, completed the work, and received a total payment of ₹1,040 for doing the work. What is $$A_2$$ 's share in the total payment received?
Ravi buys 5 pens at ₹150 each, 2 pencils at ₹100 each, and 3 notebooks at ₹250 each. What is the average expenditure incurred by Ravi per article?