A biotechnologist started an automated half-hourly recording of the conditions of a cell culture at 9 AM on 13 January 2

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Gmat_mission: Legendary Member; Posts: 1622; Joined: Thu Mar 01, 2018 7:22 amFollowed by: 2 members

by Gmat_mission » Thu Dec 17, 2020 1:06 pm

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A biotechnologist started an automated half-hourly recording of the conditions of a cell culture at 9 AM on 13 January 2015. The dial on the recording device moved clockwise through one interval (for example, from A to B) after every 10 recordings. If the dial was at point A at 9 AM on 13 January 2015, what was the position of the dial, time, and date respectively when the 420th recording of the cell culture was taken?

A. B, 3 AM, 21 January 2015

B. B, 6 AM, 21 January 2015

C. C, 6 PM, 21 January 2015

D. C, 3 AM, 22 January 2015

E. B, 6 AM, 22 January 2015

Answer: D

Source: e-GMAT

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Re: A biotechnologist started an automated half-hourly recording of the conditions of a cell culture at 9 AM on 13 Janua

by Scott@TargetTestPrep » Wed Dec 23, 2020 4:07 pm

Gmat_mission wrote: ↑
Thu Dec 17, 2020 1:06 pm
QS079.png

A biotechnologist started an automated half-hourly recording of the conditions of a cell culture at 9 AM on 13 January 2015. The dial on the recording device moved clockwise through one interval (for example, from A to B) after every 10 recordings. If the dial was at point A at 9 AM on 13 January 2015, what was the position of the dial, time, and date respectively when the 420th recording of the cell culture was taken?

A. B, 3 AM, 21 January 2015

B. B, 6 AM, 21 January 2015

C. C, 6 PM, 21 January 2015

D. C, 3 AM, 22 January 2015

E. B, 6 AM, 22 January 2015

Answer: D

Solution:

Since 420 recordings were taken and since recordings are taken every 30 minutes, the 420th reading is taken 210 hours after 9 AM on January 13th. Notice that 210 hours = 8 days 18 hours. Notice also that 8 days from 9 AM, January 13th is 9 AM, January 21st. Adding another 18 hours, we arrive at 3 AM, January 22nd. There is only one answer choice with this date and time, so the correct answer is D.

Answer: D

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