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Which of the following is equal

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Which of the following is equal [#permalink] New post 18 Mar 2018, 09:40
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Question Stats:

70% (00:42) correct 29% (00:48) wrong based on 17 sessions
Which of the following is equal to \(\frac{1}{4}\) of \(0.01\) percent?


(A) 0.000025
(B) 0.00025
(C) 0.0025
(D) 0.025
(E) 0.25
[Reveal] Spoiler: OA

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Re: Which of the following is equal [#permalink] New post 23 Mar 2018, 08:11
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\(\frac{1}{4}=0.25\)
\(0.01\) percent = \(\frac{0.01}{100} = 0.0001\)
Hence we are asked to find \(0.25 * 0.0001\)
\(25 *1 = 25\) now to add the number of zeros after decimal and before 25 count the number of zeros in the two numbers that were multiplied.
i.e \(2\)for \(0.25\)and \(4\) for \(0.0001\) so altogether \(6\)
two places has already been filled by 25 hence we need four zeros after decimal
\(0.000025\)
option A
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Re: Which of the following is equal [#permalink] New post 03 May 2018, 09:52
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Carcass wrote:
Which of the following is equal to \(\frac{1}{4}\) of \(0.01\) percent?


(A) 0.000025
(B) 0.00025
(C) 0.0025
(D) 0.025
(E) 0.25


10% = 0.1
1% = 0.01
0.1% = 0.001
0.01% = 0.0001

So, 1/4 of 0.01% = 1/4 of 0.0001
= (0.25)(0.0001)
= 0.000025

Answer: A

Cheers,
Brent
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Re: Which of the following is equal [#permalink] New post 03 May 2018, 09:57
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Expert's post
Carcass wrote:
Which of the following is equal to \(\frac{1}{4}\) of \(0.01\) percent?


(A) 0.000025
(B) 0.00025
(C) 0.0025
(D) 0.025
(E) 0.25


A different approach.

Notice that 1/4 of 0.01% = 0.01% of 1/4 = 0.01% of 0.25

Now look for a pattern....

100% of 0.25 = 0.25
10% of 0.25 = 0.025
1% of 0.25 = 0.0025
0.1% of 0.25 = 0.00025
0.01% of 0.25 = 0.000025

Answer: A

Cheers,
Brent
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Re: Which of the following is equal   [#permalink] 03 May 2018, 09:57
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