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If 80 lamps can be lighted, 5 hours per day for 10 days for Rs. 21.25,
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Bunuel
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If 80 lamps can be lighted, 5 hours per day for 10 days for Rs. 21.25, [#permalink] New post  21 Jan 2021, 02:00
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If 80 lamps can be lighted, 5 hours per day for 10 days for $21.25, then the number of lamps, which can be lighted 4 hours daily for 30 days, for $76.50, is

(A) 100
(B) 120
(C) 150
(D) 160
(E) 180
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Re: If 80 lamps can be lighted, 5 hours per day for 10 days for Rs. 21.25, [#permalink] New post  24 Jan 2021, 11:07
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Bunuel wrote:
If 80 lamps can be lighted, 5 hours per day for 10 days for $21.25, then the number of lamps, which can be lighted 4 hours daily for 30 days, for $6.50, is

(A) 100
(B) 120
(C) 150
(D) 160
(E) 180


Dear Bunuel, Kindly review this question. If 120 is the answer then the second value should be $76.50 (Reverse approach)
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meanup
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Re: If 80 lamps can be lighted, 5 hours per day for 10 days for Rs. 21.25, [#permalink] New post  24 Jan 2021, 11:08
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\(\frac{5*10*21.25}{80}=\frac{4*30*76.50}{x}\)

\(x= 120\)
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Bunuel
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Re: If 80 lamps can be lighted, 5 hours per day for 10 days for Rs. 21.25, [#permalink] New post  24 Jan 2021, 11:10
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meanup wrote:
Bunuel wrote:
If 80 lamps can be lighted, 5 hours per day for 10 days for $21.25, then the number of lamps, which can be lighted 4 hours daily for 30 days, for $6.50, is

(A) 100
(B) 120
(C) 150
(D) 160
(E) 180


Dear Bunuel, Kindly review this question. If 120 is the answer then the second value should be $76.50 (Reverse approach)

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DS: DS Standard deviation | Inequalities | 700+ GMAT Data Sufficiency Questions With Explanations | Tough and tricky exponents and roots questions | The Discreet Charm of the DS | Devil's Dozen!!! | Number Properties set | New DS set
MIXED: GMAT Club's Complete Questions' Bank | SEVEN SAMURAI OF 2012 | Tricky questions from previous years. | Special Questions' Directory | Best Of The Best Of 2017 | The Best Of Quant of 2016 | 20 hardest and 20 best questions of 2015 | 15 best topics of 2015 | Seven Samurai of 2012 | GMAT Probability Questions

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