I don't understand the strategy to approach this question from 13th OG edition (click image to make bigger):
I don't understand exactly what the approach is for this?
Day 5 Email
This topic has expert replies
GMAT/MBA Expert
- Brent@GMATPrepNow
- GMAT Instructor
- Posts: 16207
- Joined: Mon Dec 08, 2008 6:26 pm
- Location: Vancouver, BC
- Thanked: 5254 times
- Followed by:1268 members
- GMAT Score:770
I'm moving this to the Problem Solving forum.What is the 25th digit to the right of the decimal point in the decimal form of 6/11?
A) 3
B) 4
C) 5
D) 6
E) 7
If we use LONG DIVISION and divide 6 by 11, we see a pattern emerge.
We get: 6/11 = 0.5454....
So, the 1st digit to the right of the decimal point is 5
The 2nd digit to the right of the decimal point is 4
The 3rd digit to the right of the decimal point is 5
The 4th digit to the right of the decimal point is 4
and so on...
Every ODD digit (1st, 3rd, 5th, etc) is 5
Every EVEN digit (2nd, 4th, 6th etc) is 4
So, the 25th digit will be 5
Answer: C
Cheers,
Brent
GMAT/MBA Expert
- [email protected]
- Elite Legendary Member
- Posts: 10392
- Joined: Sun Jun 23, 2013 6:38 pm
- Location: Palo Alto, CA
- Thanked: 2867 times
- Followed by:511 members
- GMAT Score:800
Hi deepti.sabbella,
The GMAT Quant section will include a number of questions that will require to convert one form of data into another. You might be asked for "unit conversions", which include minutes to seconds, dollars to cents, etc. You might also be asked to convert fractions to decimals to percents.
Here, knowing the value of 1/11 makes this question fairly straightforward.
1/11 is a "repeater"; 1/11 = .09090909etc
So 6/11 is 6 times that + .54545454etc.
Since we're asked for the 25th digit, we're asked for which digit appears in odd "spots"
Final Answer: 5 - C
GMAT assassins aren't born, they're made,
Rich
The GMAT Quant section will include a number of questions that will require to convert one form of data into another. You might be asked for "unit conversions", which include minutes to seconds, dollars to cents, etc. You might also be asked to convert fractions to decimals to percents.
Here, knowing the value of 1/11 makes this question fairly straightforward.
1/11 is a "repeater"; 1/11 = .09090909etc
So 6/11 is 6 times that + .54545454etc.
Since we're asked for the 25th digit, we're asked for which digit appears in odd "spots"
Final Answer: 5 - C
GMAT assassins aren't born, they're made,
Rich