The sum of the digits of a 2 digit number is 9. When 27 is added to the number, the digits get interchanged. Find the number.

A shopkeeper buys three products a, b, c and sells them at 20%, 30%, 40% profit, respectively. What is ratio of the selling price of these products, if the ratio of their cost prices is 4:3 :2?

S1 can do a piece of work alone in 9 days, S2 can do the same work alone in 18 days, while S3 can do it alone in 27 days. They work together and complete the work, and receive a total of ₹ 726 as payment for doing the work. What is the combined share of S2 and S3, taken together from the above amount?

The ratio of the number of boys and girls in a college is 6 : 7. If the percentage increase in the number of boys and girls be 20% and 10% respectively, what will be the new ratio?

The length of a hollow thick cylindrical metallic pipe is 6 cm and its total surface area including the surface at the ends is 98π sq. cm. If the outer diameter is 8 cm, then the inner diameter in cm is 

In an office, 70% of the total number of employees are females. 80 % of the total number of employees, including 85 males, got promotion. If there are 105 female employees, then what percentage of female employees got promotion?

Which of the two numbers should be reduced in the ratio of 15:19 so that the ratio becomes 3: 4?

A man has eaten 100 grapes in 5 days. He eats 6 more grapes every day in comparison to the previous day. How many grapes did he eat on the first day?