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A googol is the number that is written as 1 followed by 100 [#permalink] 00:00

Question Stats: 18% (02:05) correct 81% (02:19) wrong based on 11 sessions
A googol is the number that is written as 1 followed by 100 zeros. if G represents a googol, what is the sum of the digits of G/8 + G/5 + G/4 + G/2 ?

a. 13
b. 22
c. 107
d. 400
e. 1075
[Reveal] Spoiler: OA

Last edited by Bunuel on 08 May 2018, 03:19, edited 3 times in total.
Edited by carcass GRE Prep Club Legend  Joined: 07 Jun 2014
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GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
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Expert's post
Hi

We can write G= $$1*10^1^0^0$$ or $$1000*10^9^7$$

Now evaluating all the component number

$$\frac{G}{8}$$ =$$\frac{1000*10^9^7}{8}$$ =$$125 * 10^9^7$$.

$$\frac{G}{5}$$ =$$\frac{1000*10^9^7}{5}$$ =$$200 * 10^9^7$$.

$$\frac{G}{4}$$ =$$\frac{1000*10^9^7}{4}$$ =$$250 * 10^9^7$$.

$$\frac{G}{2}$$ =$$\frac{1000*10^9^7}{2}$$ =$$500 * 10^9^7$$.

$$1075 * 10^9^7$$.

Thus sum of digits are 1+0+7+5 =13. Hence option A is correct.

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Expert's post
Ciara wrote:
A googol is the number that is written as 1 followed by 100 zeros. if G represents a googol, what is the sum of the digits of G/8 + G/5 + G/4 + G/2 ?

a. 13
b. 22
c. 107
d. 400
e. 1075

G = 10^100
We can rewrite this as follows: G = (10^3)(10^97)
Or we can say G = (1000)(10^97)

So, G/8 = (1000)(10^97)/8 = (125)(10^97)
G/5 = (1000)(10^97)/5 = (200)(10^97)
G/4 = (1000)(10^97)/4 = (250)(10^97)
G/2 = (1000)(10^97)/2 = (500)(10^97)

So, G/8 + G/5 + G/4 + G/2 = (125)(10^97) + (200)(10^97) + (250)(10^97) + (500)(10^97)
= (10^97)(125 + 200 + 250 + 500)
= (10^97)(1075)
This evaluates to be 1075 followed by 97 zeros
So, the sum of the digits = 1 + 0 + 7 + 5 + a bunch of zeros
= 13

[Reveal] Spoiler:
A

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Re: A googol is the number that is written as 1 followed by 100 [#permalink]
Expert's post
Ciara wrote:
A googol is the number that is written as 1 followed by 100 zeros. if G represents a googol, what is the sum of the digits of G/8 + G/5 + G/4 + G/2 ?

a. 13
b. 22
c. 107
d. 400
e. 1075

We can get common denominators in our expression and we have:

5G/40 + 8G/40 + 10G/40 + 20G/40

43G/40

43/40 x G

1.075 x 10^100

1,075 x 10^97

We can see that the number is 1,075 followed by 97 zeros; thus, the sum of the digits is 1 + 7 + 5 = 13 (we don’t need to add any digits that are 0).

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# Jeffrey Miller

Jeff@TargetTestPrep.com

See why Target Test Prep is the top rated GRE quant course on GRE Prep Club. Read Our Reviews Re: A googol is the number that is written as 1 followed by 100   [#permalink] 09 May 2018, 15:01
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