What percent decrease in salary would exactly cancel out the 20 percent increase? 

What is the least number of square tiles required to pave the floor of a room 15 m ,17cm long and 9 m, 2 broad ?

The average age of three boys is 18 years and their age ratio is 2: 3: 4, then what is the age of the youngest boy?

How many seconds will a 500-meter-long train take to cross a man walking with a speed of 3 km/hr. in the direction of the moving train if the speed of the train is 63 km/hr? 

A missile travels at 1422 km/h. How many metres does it travel in one second?

In a school with 600 students the average age of the boys is 12 years and that of the girl is 11 years. If he average age of the students is 11 years 9 months, then the number of girls in the school is

If 3x+0.04x=0.608, find x. 

Ram and Shyam are travelling from point A to B, which are 60 km apart. Travelling at a certain speed ram takes one hour more than Shyam to reach point B. If Ram doubles his speed he will take 30 minutes less than Shyam to reach point B. At what speed was Ram driving from point A to B ?