Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the odd number from the given alternatives.

If C = 1200 and D = 1500, then D is how much percent more than C?

A bag has Rs 20 in the form of 1­-rupee, 50­-paise and 10­-paise coins in the ratio of 2:3:5. Find the number of 50­-paise coins.

A bus runs at 50 kmph. If the speed is increased by 10 kmph, it will cover 20 km more in the same time. Find the actual distance covered?

Car B is running twice as fast as car A. If car A covers a distance of 90 km in 1 1/2 hrs, what is the speed of car B?

A train is moving at the speed of 72 km/hr. How many seconds will it take to cover a distance of 1400 m ?

Select the related number from the given alternatives.
0.02 : 0.002 :: 1/3 : ?

The mean of 20 observations is 19. One more observation is included and the new mean becomes 20. The 21st observation is