The number of girls in a class is 5 times the number of boys. Which of the following can not be the total number of children in the class?

A number is doubled and 9 is added. If the resultant is trebled, it becomes 75. What is the number?

The difference between the cost price and sale price of an article is Tk. 240. If the profit is 20%, the selli...

The sum of two numbers is 25 and their difference is 13. find their product.

In what ratio must tea at Tk. 62 per kg be mixed with tea at Tk. 72 per kg so that the mixture must be worth T...

The average of five numbers is 27. If one number is excluded, the average becomes 25. The excluded number is :

If a train runs at 40 kmph, it reaches its destination late by 11 minutes but if it runs at 50 kmph, it is lat...