Is the range of the 5 numbers in the list above less than 30

Question

17 , x , 35 ,12, y

Is the range of the 5 numbers in the list above less than 30 ?

(1) 6<= x<= 20
(2) y = 2x

AMITAGARWAL2 · Answer

1: Y is not known so cannot say that
2. for smaller X answer is Yes but larger values answer is NO

But together ans is Yes. SO C

blackprince1 · Answer

Range = largest - smallest

1) x(min) = 6 
Range = 35-6 I.e. < 30 if x is smaller than y. But no info on y. So can't decide.

2) x=2y, x and y could be 15 and 30 or 100 and 200 or any other pair. Nothing can be concluded on range.

Combining 1&2 x=6, y=12 is min value of x and y. Range = 30 or less 
Max value of x and y is 20 and 40.
Range = 40-12+1 I.e. <30

So range has to be less than 30. Hence C

Posted from my mobile device

nhattruong1302 · Answer

17 , x , 35 ,12, y

Is the range of the 5 numbers in the list above less than 30 ?

(1) 6<= x<= 20
(2) y = 2x

the answer is C

(1) 6<= x <=20 , unknown y => insufficient

(2) y=2x , unknown range of x and y => insufficient

(1)+(2) 6<= x <= 20 and 12<= y <= 40. Now we consider the two extreme value x=6 => y=12, range = 35-6 <30
if y = 40 then x=20, range =35-12 <30. Therefore, (1)+(2) SUFFICIENT

KarishmaB · Answer

17 , x , 35 ,12, y

Without x and y, the range is 35 - 12 = 23 which is less than 30.

(1) 6<= x<= 20

Ignoring y, if x is within 6 to 20, the range of the set will stay less than 30. Maximum range can be 35 - 6 = 29. But we don't know y. If y is 10, range will stay less than 30 but if y is 100, the range will be much higher than 30.

(2) y = 2x
We don't know the values of x and y so cannot say what the range will be.

Using both, If x lies between 6 and 20, y will lie between 12 and 40. But y will be 40 only when x is 20. Even in that case, the range will be 40 - 12 = 28. We have already seen that if x is 6 and y is 12, the range will stay below 30. In all in-between cases, the range will be below 30 only.

Answer (C)

bumpbot · Answer

Automated notice from GMAT Club BumpBot: 

A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.

 This post was generated automatically.

Is the range of the 5 numbers in the list above less than 30

Prep Toolkit

Top 5 GMAT Debrief Videos

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

From 555 to 765: 210-point Improvement

Perfect 805 Score Debrief by Julia

My Rewards

GMAT Data Sufficiency (DS) Questions

Is the range of the 5 numbers in the list above less than 30

Prep Toolkit

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

From 555 to 765: 210-point Improvement

Perfect 805 Score Debrief by Julia

My Rewards