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Water lily grows at such a rate that it covers double the surface that

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Water lily grows at such a rate that it covers double the surface that  [#permalink]

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New post 29 Jan 2019, 23:47
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A
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E

Difficulty:

  45% (medium)

Question Stats:

33% (01:55) correct 67% (01:18) wrong based on 12 sessions

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Water lily grows at such a rate that it covers double the surface that it covered the day before. It takes 30 days for a water lily to cover the entire surface of the pond. How long would it take for two water lilies of the same size to cover the entire surface of the same pond?

A. 8.33
B. 12.5
C. 15
D. 20
E. 29

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Re: Water lily grows at such a rate that it covers double the surface that  [#permalink]

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New post 29 Jan 2019, 23:49
Bunuel wrote:
Water lily grows at such a rate that it covers double the surface that it covered the day before. It takes 30 days for a water lily to cover the entire surface of the pond. How long would it take for two water lilies of the same size to cover the entire surface of the same pond?

A. 8.33
B. 12.5
C. 15
D. 20
E. 29


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http://gmatclub.com/forum/it-takes-30-d ... 40269.html
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Resources:
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: Water lily grows at such a rate that it covers double the surface that  [#permalink]

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New post 30 Jan 2019, 00:02
Bunuel wrote:
Water lily grows at such a rate that it covers double the surface that it covered the day before. It takes 30 days for a water lily to cover the entire surface of the pond. How long would it take for two water lilies of the same size to cover the entire surface of the same pond?

A. 8.33
B. 12.5
C. 15
D. 20
E. 29


There is 1 water lily at the beginning.
After 1 day, there will be 2 water lilies.
After 2 days, there will be 4 water lilies.
and so on till the pond is covered in 30 days.

What happens if we start with 2 water lilies? We are at the same state as we were at the end of Day 1. So we will take another 29 days to cover the pond.
All that happens is that we save 1 day in which 1 water lily had doubled to become 2 water lilies.

Answer (E)
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Re: Water lily grows at such a rate that it covers double the surface that   [#permalink] 30 Jan 2019, 00:02
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