Infosys Company Numerical Ability Percentage

a mixture of 80 liters of milk and water contain 10% water how much water must be added to make water 20% in the new mixture?

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Infosys Other Question

what rate percentage is 1 minute 48 seconds to an hour? ) A person walks on a plain land at 4 km/hr and up the slope at 3 km/hr and comes
down at 6 km/hr and walks on the plain land again at 4 km/hr. if he started at 3:00
pm and comes back at 9:00 pm. What is the one way distance?