Cost of 18 shirts and 45 trousers is Rs 68,400. What is the cost of 10 shirts and 25 trousers?

What is compound interest accrued on an amount of Rs 45000 in 2 yr @ 9% per annum ? 

A 275 m long train crosses a platform of equal length in 33 s. What is the speed of the train in km/h? 

75% of a number is equal to three-seventh of another number. What is the ratio between the first number and the second number respectively ? 

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Number of students appeared in 2006 from school A is what per cent of the total number of students appeared from school A for all the years together ? 

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What is the ratio between the total number of students appeared in 2004 and 2005 together from' schools C and D respectively? 

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What is the average number of students appeared from all the schools in 2007?

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What is the average number of students appeared from school B for all the years ?