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test 39 #13

This topic has 2 expert replies and 1 member reply

test 39 #13

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13. On a certain scale of intensity, each increment of 10 in magnitude represents a tenfold increase in intensity. On this scale, an intensity corresponding to a magnitude of 165 is how many times an intensity corresponding to a magnitude of 125?
(A) 40
(B) 100
(C) 400
(D) 1,000
(E) 10,000


Hi,
I thought the answer was simply C) but turned out to be E)...... Can anyone help pls?

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On a certain scale of intensity, each increment of 10 in magnitude represents a tenfold increase in intensity. On this scale, an intensity corresponding to a magnitude of 165 is how many times an intensity corresponding to a magnitude of 125?
(A) 40
(B) 100
(C) 400
(D) 1,000
(E) 10,000

10 increase in magnitute represents a tenfold increase in intensity
10 increase ---- Factor number by 10
20 increase ----- factor by 10 * Factor by 10
40 increase ----- factor by 10*factor by 10* factor by 10* factor by 10 = 10,000

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dunkin77 wrote:
13. On a certain scale of intensity, each increment of 10 in magnitude represents a tenfold increase in intensity. On this scale, an intensity corresponding to a magnitude of 165 is how many times an intensity corresponding to a magnitude of 125?
(A) 40
(B) 100
(C) 400
(D) 1,000
(E) 10,000
Since 125 is 40 away from 165, the intensity of 165 is 10 x 10 x 10 x 10 = 10,000 times that of 125.

Answer: E

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Here's a related question to practice with: https://www.beatthegmat.com/intensity-scale-readings-t273997.html

Cheers,
Brent

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