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When an express train crosses a platform of 300m long in one minute, a passenger standing there watches a stray dog running at a speed of 15 m/s running in opposite direction. The dog crosses the train in 1/3 minutes. What is the speed of the train?

Of the five numbers, the first number is five more than second number , the second number is half of the third number, the third number is 2/3^rd of the forth number and the fourth number is twice of the fifth number. The average of the five numbers is 18. Find the average of smallest and largest number.

In a company, only 20% of the female employees and 70% of the male employees can get a promotion. If the ratio of female and male employees in the company is 2 : 3, then find the percentage of employees who are not getting a promotion?

In an election there were 25,000 voters, later 34% votes were declared invalid out of valid votes A and C received votes in the ratio 16 ∶ 7 and B received 37.5% less votes than A. Calculate the votes received by B is what percentage of valid votes.

The sum of squares of four numbers is 370, and the sum of the second and third term is 17. Four of these numbers are in proportion. The ratio of first two terms is 5 : 7. Find the average of the four numbers.

What should come in place of the question mark '?' in the following number series?

10, 9, 17, 50, ?, 994

What should come in place of the question mark '?' in the following number series?

4, 5, 12, 39, 160, ?

What should come in place of the question mark '?' in the following number series?

40, 20, 19.5, 19.5, ?, 27.75

What should come in place of the question mark '?' in the following number series?

2.5, 3.5, 5, 18, 68, ?

What should come in place of the question mark '?' in the following number series?

16, 17, 36, 111, ?, 2245