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Fresh grapes have 75% water and the rest is pulp. During the process of drying, it was found that at a particular stage it contained 50% water by weight. What is the percentage reduction in the weight of the original quantity of fresh grapes?

How many terms are there in the expression (1 + x2 + x4)10 when it is expanded?

In how many ways can five integers be selected out of the first 30 natural numbers so that their product ends with five?

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In a aeroplane, the fuel burnt is directly proportional to the square root of its speed. If the aeroplane travels 800 km at a speed of 441 km/hr, the amount of fuel burnt is equal to 1250 litres. Find the distance travelled by the aeroplane, if 2000 litres of fuel was burnt while travelling at 784 km/hr.??

the fractional equivalent of 3.232323......is

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