How Many Days?

Logic Level 2

There is a plant sale. The plant multiplies each day. John wants one. If he buys one, it will take 10 days to cover his yard. He speeds it up. He buys 2 plants. How many days will it take for the plants to cover his yard?


The answer is 9.

Brian Chen by Brian Chen , 21, USA

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1 solution

Brian Chen
Feb 21, 2018

When 2 plants are together at same growth rate, the number will be 1 less than before.

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Care to explain why exactly?

Peter van der Linden - 3 years, 3 months ago

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I assumed that what is meant by "the plant multiplies each day" is that it doubles in size each day. So with 2 plants, after 9 days each of the plants covers half the yard, and thus together cover the whole yard.

Brian Charlesworth - 3 years, 3 months ago

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Thought something like that yes, but I didn't want to assume it ;)

Peter van der Linden - 3 years, 3 months ago

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