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GATE EC 2020 : GA - Quiz 3
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Question 1
A can contains a mixture of two liquids A and B in the ratio 7: 5 . When 9 litres of mixture is drawn off and the can is filled with B with same amount, the ratio of A and B becomes 7: 9 . How many litres of liquid A was contained by the can initially?
Question 2
A bank gives interest on a sum at the rate of 5% for 1st years and then 8% interest for the next 2 years. The amount received after 3 years is Rs. 15309. What was the sum if the interest is compounded annually?
Question 3
The average age of husband and wife who were married 7 years ago, was 25 years at the time of their marriage. Now the average age of the family including husband, wife and a child, born during the interval is 22 years. What is the present age of the child?
Question 4
The LCM of two numbers is 12 times of HCF. The sum of HCF and LCM is 403 . If both the numbers are smaller than LCM. Find both the numbers.
Question 5
Pipes A and B can fill a tank in one hour and two hours respectively while pipe C can empty the filled tank in one hour and fifteen minutes. A and C are turned on together at 9 a.m. After 2 hours, only A is closed and B is turned on. When will the tank be emptied?
Question 6
An open box is made of wood 2 cm thick. Its internal length is 86 cm, breadth 46 cm and height is 38 cm. The cost of painting the outer surface of the box at Rs. 10/m2 is:
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Mar 28ESE & GATE EC