3i-Infotech Company Numerical Ability Percentage

20% of a 6 litre solution and 60% of 4 litre solution are mixed. What percentage of the mixture of solution

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Perimeter of front wheel =30, back wheel = 20. If front wheel revolves 240 times. How many revolutions will the back wheel take? City A's population is 68000, decreasing at a rate of 80 people per year. City B having population 42000 is increasing at a rate of 120 people per year. In how many years both the cities will have same population?