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What should come in the place of (?) in the given series?

216, 212, 221, 196, 245, 124, ?

What should come in the place of (?) in the given series?

 2421,1909,1566,1350,1225,?

What should come in the place of (?) in the given series ?

3, 9, 45, 315, 2835 ,?

A train of length 200 m running at speed 90 km/hr crosses a tunnel in 24 seconds and another train running at speed 108 km/hr crosses the same tunnel in 30 seconds. Find the length of the second train.

A boat's speed in calm water is 5 km/h and the speed of stream is P. It travels 6 km against the current and returns downstream to its starting point in 2 hours and 30 minutes. Determine the value of P.

A boy played four games in a five-game series and averaged 40 runs per game. In his last game, he scores 80 runs, which boosts his overall average by (x - 5)%. What would be the value of (x + 9)?

A scheme was seen to increase the investment by 60% in 6 years at simple interest. What will be the compound interest of Rs. 25000 invested for 4 years at the same rate?

A sum of money becomes eight times in 3 years if the amount is compounded annually. In how much time, the same amount at the same compound interest rate will become sixteen times?

In a class there are 30% of girls and 70% of boys are studying together. If the 40% of girls and 60% of boys are passed in a test, then what is the percentage of failed students ?

A man sells two books for Rs. 1110. He earns 15% loss on the first book and 25% profit on the second book. If the cost price of first book is equal to selling price of the second book, find cost price of two books.