Eight years ago the ratio of the age of A to that of B was 5:7. After 16 years the ratio of their ages will be 4:5. What is the difference between the present ages of A and B ?

A shopkeeper sold a TV at 18% discount on print rate. If the customer paid ?8856 forthe TV and the printed price is 20% more than its cost price, what is the cost price of the TV ?

Ram, Rakesh and Vijay invested in the ratio of 3:5:6 in business. If the amount invested by Rakesh is ?75000, what is the total amount invested in the business ?

An electrician bought an old fan for ?420 and spent 25% of it on repairing. If he wants to make a profit of ? 126, what percentage of the cost price should be added to it ?

If four-fifths of the marks scored by Ambuj in Maths is equal to four-thirds of the marks scored by him in Physics, and if the sum of marks scored by him in both the subjects is 120, how many marks did he score in physics ?

A train runs for five hours at a speed of 40 kmh-1 and for the next 20 hours at a speed of 30 kmh- 1 , covering 2/3 of the total distance. If the remaining distance is to be covered in 8 hours, what should be speed of the train ?