Mathematics

Q72

A mixture contains alcohol and water in the ratio of 12:5. On adding 14 litres of water, the ratio becomes 4:3. The quantity of alcohol is:

Q75

A hall is 15m long and 12m wide. If floor + ceiling area equals wall area, volume is

Q76

If * is a binary operation in A, then:

Q78

A man buys shirts at Rs.80 each and sells them at Rs.100 each. What percentage profit does he make?

Q79

A man takes 50 minutes to cover a certain distance at a speed of 6 km/hr. If he walks with a speed of 10 km/hr, he covers the same distance in:

Q80

In order to write counting upto 100, how many times the key of the typewriter will have to be pressed?

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