Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
If y divisible by 24. The rule says if number is divisible by all factors of other number the last number is a factor of the first So, 24=3*2*2*2
S1. y is divisible by 6, which 3*2. Do not know about 2*2. Not sufficient
S2. y is divisible by 4, which 2*2. Do not know about 3*2. Not sufficient
S1+S2 says that y divisible by 3*2 and 2*2. Trick is that it is enough to be 3*2*2=12 to be divisible by 4 and 6 but not enough to be divisible by 24. But if we have 3*2*2*2=24 it is enough for all. Not sufficient
Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.