A trader sells 150 metres of cloth for Rs. 6, 600 and he sells 300 metres of cloth for Rs. 12, 750. How much concession does the trader give per metre of cloth, when he sells 300 metres of cloth?

When 3888 is divided by the square of a number and the answer so obtained is multiplied by 21, the final answer so obtained is 252. What is the number?

The sum of the digits of a two digit number is 14. The difference between the first digit and the second digit of the two digit number is 4. What is the two digit number ?

A car runs at the speed of 40 when not serviced and runs at 65 kmph. when serviced. After servicing, the car covers a certain distance in 5 hours. How much $approximate$ time will the car take to cover the same distance when not serviced?

After sevicing, the distace covered in 5 hours = 65 $\times$ 5 = 325 km Without servicing, speed = 40 km/h Time = $Distance \over speed$ = $325 \over 40$ = 8 hours

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In the years 2010 and 2011 together, the average number of books bought by each buyer through offline mode was 5. If $3 \over 5$th of the number of buyers buying books through offline mode, during the years 2010 and 2011 together were of the age group more than or equal to 30 years, then how many buyers were less than 30 years of age ?

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What is the respective ratio of the total number of books sold through Online Mode in the years 2010 and 2011 together and the total number of books sold through offline mode in the same years together ?

Number of books sold through offline mode in the years 2010 and 2011 = (414 + 306) thousands = 720 thousands Number of books sold through online mode = (690 + 720 - 720) thousands = 690 thousands Required ratio = 690 : 720 = 23 : 24

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In the year 2013 out of the total number of books sold in the fiction category $4 \over 15$ th of the books sold were written by Indian authors. Number of books written by the foreign authors in the fiction category forms, what percent of the total number of books sold (non-fiction and fiction category together) in the year 2013 ?

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What is the difference between the number of fiction books sold in years 2012 and 2013 together and the number of non- fiction books sold in the years 2011 and 2012 together ?