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QA – Placement Quizzes | Percentages | Question 16

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  • Last Updated : 28 Jun, 2021

Sudheer’s family can use the water up to 10 days when the tank is full. If the water consumption of his family is increased by 25% per day, how many days will the water tank last?
(A) 5
(B) 6
(C) 7
(D) 8

Answer: (D)

Explanation: Let the water capacity of the tank be x liters. Then,
Initial water consumption rate = x/10 ltr per day
New water consumption rate after the increase by 25% = x/10 * (1 + 25/100) ltr per day = x/10 * 1.25 = x/8 ltr per day
The water tank last in number of days = full tank capacity in ltr / new water consumption rate in ltr per day = x / (x/8) = 8 days.

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