Search found 5 matches
#144 in 13th edition OG
Are all of the numbers in a certain list of 15 numbers equal?
(1) the sum of all the numbers in the list is 60
(2) the sum of any 3 numbers in the list is 12
Thanks!
- by yeshuashley
Wed Jan 14, 2015 8:08 pm- Forum: Data Sufficiency
- Topic: #144 in 13th edition OG
- Replies: 3
- Views: 1897
how many steps are there?
The OG explanation didn't make sense, and I would like to get your explanations on this one... If the two floors in a certain building are 9 feet apart, how many steps are there in a set of stairs that extends from the first floor to the second floor of the building? (1) each step is 3/4 foot high (...
- by yeshuashley
Wed Jan 14, 2015 7:20 pm- Forum: Data Sufficiency
- Topic: how many steps are there?
- Replies: 2
- Views: 2560
#172 in 13th edition OG
For any positive integer n, the sum of the first n positive integers equals n(n+1)/2. What is the sum of all the even integers between 99 and 301?
A. 10,100
B. 20,200
C. 22,650
D. 40,200
E. 45,150
- by yeshuashley
Wed Oct 01, 2014 7:30 pm- Forum: Problem Solving
- Topic: #172 in 13th edition OG
- Replies: 6
- Views: 2131
compound interest
Saw this problem in an article on Beat the GMAT but would somebody please explain how to solve this problem? Thank you! Michelle deposited a certain sum of money in a savings account on July 1st, 2012. She earns an 8% annual interest compounded semi-annually. The sum of money in the account on Janua...
- by yeshuashley
Fri Sep 26, 2014 9:41 am- Forum: Problem Solving
- Topic: compound interest
- Replies: 2
- Views: 1381
13th edition OG #80
Could somebody explain how to solve this? I didn't quite understand the explanation on OG. THANKS! M is the sum of the reciprocals of the consecutive integers from 201 to 300, inclusive.which of the following is true? A. 1/3<M<1/2 B.1/5<M<1/3 C.1/7<M<1/5 D. 1/9<M<1/7 E.1/12<M<1/9
- by yeshuashley
Wed Sep 24, 2014 6:55 pm- Forum: GMAT Math
- Topic: 13th edition OG #80
- Replies: 4
- Views: 3505