2. If and , then the value of a + b is?

The population of a village decreases at the rate of 20% per annum. If its population 2 years ago was 10000, t...

A student scores 55% marks in 8 papers of 100 marks each. He scores 15% of his total marks in English. How muc...

The ratio of the number of boys and girls in a college is 7: 8. If the percentage increase in the number of bo...

Two buses start from a bus terminal with a speed of 20 km/h at interval of 10 minutes. What is the speed of a...

It takes 5 hours to fill a container using machine A. The same container can be filled using machine B in 10 h...

Melissa is four times as old as Jim. Pat is 5 years older than Melissa. If Jim is y years old, how old is Pat?