F/J=3/2, (F+40)/J=5/3, J-?GHong14 wrote:
3F+120=5J
2F=3J, F=3J/2
9J+240=10J, J=240
PS2
This topic has expert replies
Source: Beat The GMAT — Problem Solving |
-
Night reader
- Legendary Member
- Posts: 1337
- Joined: Sat Dec 27, 2008 6:29 pm
- Thanked: 127 times
- Followed by:10 members
-
VivianKerr
- GMAT Instructor
- Posts: 1035
- Joined: Fri Dec 17, 2010 11:13 am
- Location: Los Angeles, CA
- Thanked: 474 times
- Followed by:365 members
This is a great question to Backsolve, plugging in each answer choice.
If we assume Alex's fuel oil bill for January was $240, we can set up a proportion with the ratio given.
3/2 = Feb/Jan
3/2 = Feb/240
720 = 2(Feb)
360 = February's fuel oil bill
If it was $40 more, or $400, then the ratio would be 5/3. Let's reduce the final fraction to make sure:
$400/$240 = 200/120 = 100/60 = 50/30 = 5/3.
The correct answer is (A).
If we assume Alex's fuel oil bill for January was $240, we can set up a proportion with the ratio given.
3/2 = Feb/Jan
3/2 = Feb/240
720 = 2(Feb)
360 = February's fuel oil bill
If it was $40 more, or $400, then the ratio would be 5/3. Let's reduce the final fraction to make sure:
$400/$240 = 200/120 = 100/60 = 50/30 = 5/3.
The correct answer is (A).
Vivian Kerr
GMAT Rockstar, Tutor
https://www.GMATrockstar.com
https://www.yelp.com/biz/gmat-rockstar-los-angeles
Former Kaplan and Grockit instructor, freelance GMAT content creator, now offering affordable, effective, Skype-tutoring for the GMAT at $150/hr. Contact: [email protected]
Thank you for all the "thanks" and "follows"!
GMAT Rockstar, Tutor
https://www.GMATrockstar.com
https://www.yelp.com/biz/gmat-rockstar-los-angeles
Former Kaplan and Grockit instructor, freelance GMAT content creator, now offering affordable, effective, Skype-tutoring for the GMAT at $150/hr. Contact: [email protected]
Thank you for all the "thanks" and "follows"!
-
Night reader
- Legendary Member
- Posts: 1337
- Joined: Sat Dec 27, 2008 6:29 pm
- Thanked: 127 times
- Followed by:10 members
I would think twice b4 using this method, as it is too time consumingVivianKerr wrote:This is a great question to Backsolve, plugging in each answer choice.
If we assume Alex's fuel oil bill for January was $240, we can set up a proportion with the ratio given.
3/2 = Feb/Jan
3/2 = Feb/240
720 = 2(Feb)
360 = February's fuel oil bill
If it was $40 more, or $400, then the ratio would be 5/3. Let's reduce the final fraction to make sure:
$400/$240 = 200/120 = 100/60 = 50/30 = 5/3.
The correct answer is (A).
