In a blue and yellow painting, blue and yellow are used in the ratio 4 : 3. If the ratio of blue and yellow in the upper part is 2 : 3, then in what ratio will the blue : yellow be in the lower part?

If a shopkeeper sells an article at 10% loss by giving half discount on the marked price, then what will be its cost price?

At what rate of simple interest will a sum of money double in 8 years?

What is the smallest digit that must be added to the product 5786 × 5784 to make it a perfect square?

The LCM of two numbers is 48. If those numbers are in the ratio 2 : 3 then what will be their sum?

The average age of three boys is 15 years if their ages are in the ratio 3 : 5 : 7, what will be the age of the youngest boy?

There are some boys and girls in a room. The square of the number of girls is 28 less than the square of the number of boys. If two more girls join then the number of boys and girls becomes equal, then what is the total number of boys and girls in the room?

In a year, the average expenditure of a family for the first 3 months, next 4 months and last 5 months is Rs 8400 per month, Rs 10080 per month, Rs 10608. Monthly and annual savings are Rs. 8640. If so, what is the average monthly income of this family?