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kenyan_sun: Newbie | Next Rank: 10 Posts; Posts: 4; Joined: Sun Jan 13, 2008 6:54 pm

DS Help

by kenyan_sun » Tue Feb 05, 2008 7:01 pm

Hi,
I need some help in understanding how to answer this question
Q) If x and y are both positive numbers, is x greater than 75% of y

1) 5x>4y+1
2) x = 6

The answer is A.

Please explain how.

Thanks in advance

Quote

Source: Beat The GMAT — Data Sufficiency | Tue Feb 05, 2008 7:01 pm

Stuart@KaplanGMAT: GMAT Instructor; Posts: 3225; Joined: Tue Jan 08, 2008 2:40 pm; Location: Toronto; Thanked: 1710 times; Followed by:614 members; GMAT Score:800

Re: DS Help

by Stuart@KaplanGMAT » Tue Feb 05, 2008 8:17 pm

kenyan_sun wrote:Hi,
I need some help in understanding how to answer this question
Q) If x and y are both positive numbers, is x greater than 75% of y

1) 5x>4y+1
2) x = 6

The answer is A.

Please explain how.

Thanks in advance

5x > 4y + 1

x > 4/5y + 4/5

if x is greater than 80%(y) + 4/5, then x is definitely greater than 75% of y.

(Note: if x and y didn't have to be positive, this wouldn't necessarily be true.)