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Two pipes A, B can fill a tank in 24 min. and 32 min. respectively. If both the pipes are opened simultaneously, after how much time B should be closed so that the tank is full in 18 min.

A jar full of whiskey contains 40 alcohol. A part of this whisky is replaced by another containing 19 alcohols and now the percentage of alcohol was found to be 26. The quantity of whisky replaced of whisky replaced is

Four years ago, the Father's agc was three times the age of his son. The total of the ages of the father and the son after four years, will be 64 years. What is the father's age at present

In a division sum, the divisor is 10 times the quotient and 5 times the remainder. If the remainder is 46, the divident is

The average of five numbers id 27. If one number is excluded,the average becomes 25. The excluded number is