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In an examination of 100 marks, a student obtained 35 marks and failed by 5 marks. If another student wants to score 50% more than the passing marks, how many marks will he have to score?

Kalpana receives 25% discount on the purchase of an oven marked for Rs. 3,600. She receives an additional 2% discount for paying cash. How much does she pay for the oven?

Two cones are such that the ratio of their volumes is 1 : 10 and ratio of their heights is 2 : 5. What is the ratio of their base radii?

A boat travels 77 km downstream in 7 hours while 45 km upstream in 5 hours. Find the speed of boat in still water.

The value of 4.5 + 0.45 + 0.045 + 0.0045 is: 

A sum of Rs. 5,760 amounts to Rs. 7,200 in 4 years and to Rs. x in 12 years at a certain rate per cent per annum, when the interest is compounded yearly in both the cases. What is the value of x?

Aarav and Durga together can do a piece of work in 33 days. They worked together for 15 days and then Aarav left the work and Durga alone finished the remaining work in 30 days. Find the number of days in which Aarav alone can do the total work. 

A tradesman sold an article at a loss of 50%. If the selling price had been increased by Rs. 1000, there would have been a gain of 30%. What is the cost price of an article?

A number consists of two digits. The sum of the digits is 10. On reversing the digits of the number, the number decreases by 36. What is the product of the two digits?

The price of two types of rice is Rs. 15/kg and Rs. 20/kg. If both the types are mixed in the ratio 3 ∶ 2 respectively, then what is the price per kg of the mixed variety of rice?