Search found 5 matches
FDP- Please help!!
What is the tens digit of the positive integer r?
(1) The tens digit of r/10 is 3.
(2) The hundreds digit of 10r is 6.
"B" is the correct answer. How are you supposed to approach this problem?
- by thedude232
Wed Dec 29, 2010 5:27 pm- Forum: Problem Solving
- Topic: FDP- Please help!!
- Replies: 1
- Views: 951
Rate Problem
At a speed of 50 miles per hour, a certain car uses 1 gallon of gasoline every 30 miles. If the car starts with a full 12 gallon tank of gasoline and travels for 5 hrs at 50 miles per hour, the amount of gasoline used would be what fraction of a full tank? a) 3/25 b) 11/36 c) 7/12 d) 2/3 e) 25/36 Th...
- by thedude232
Wed Dec 29, 2010 5:17 pm- Forum: Problem Solving
- Topic: Rate Problem
- Replies: 1
- Views: 900
Challenging DS
If wx=y, what is the value of xy?
(1) w(x^2) = 16
(2) y = 4
The correct answer is (a). I believe you supposed to manipulate the first statement, but I am not exactly sure.
Thanks!
- by thedude232
Wed Dec 29, 2010 4:59 pm- Forum: Problem Solving
- Topic: Challenging DS
- Replies: 19
- Views: 9939
Challenging - Exponent Problem
If 2^x - 2^x-2 = 3(2^13), what is the value of x?
a) 9
b) 11
c) 13
d) 15
e) 17
The correct answer is "d". Can someone please show me how to simplify the left side of the equation. Thanks!
- by thedude232
Wed Dec 29, 2010 3:58 pm- Forum: Problem Solving
- Topic: Challenging - Exponent Problem
- Replies: 2
- Views: 1486
Challenging Problem Solving
If each term in the sum a-1 + a-2 + ... + a-n is either 7 or 77 and the sum equals 350, which of the following could be equal to n?
a) 38
b) 39
c) 40
d) 41
e) 42
The correct answer is "C" but I have been banging my head trying to figure out why. Thanks!
- by thedude232
Wed Dec 29, 2010 3:40 pm- Forum: Problem Solving
- Topic: Challenging Problem Solving
- Replies: 2
- Views: 998