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There's a river, 5 people on one side that want to cross over, and a single boat. Only two people may go into the boat at the same time. Each person needs a different amount of time to cross the river, and the boat always moves with the speed of the slowest person in the boat. How can they cross over in 20 minutes?
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Software Developer

Interviewed at Cosylab

3.9★
Sep 4, 2011

There's a river, 5 people on one side that want to cross over, and a single boat. Only two people may go into the boat at the same time. Each person needs a different amount of time to cross the river, and the boat always moves with the speed of the slowest person in the boat. How can they cross over in 20 minutes?

There are 9 marbles. All looks exactly same (color, size). But one marble is slightly heavier. You cannot tell the difference with your hand/eyes. But you have a very sensitive and accurate balance (Taraju). You have to pay Rs 1000 each time you use the balance. You need to find out the HEAVIEST marble using the balance least number of time. How many time would you use the balance to find out the heaviest marble?
avatar

Software Developer Intern

Interviewed at ComplianceQuest

4★
Oct 3, 2020

There are 9 marbles. All looks exactly same (color, size). But one marble is slightly heavier. You cannot tell the difference with your hand/eyes. But you have a very sensitive and accurate balance (Taraju). You have to pay Rs 1000 each time you use the balance. You need to find out the HEAVIEST marble using the balance least number of time. How many time would you use the balance to find out the heaviest marble?

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