Search found 18 matches

number property q.

If 3x + 7y = 8x − 18y and y > 7, then which of the following must be true? a. x <7/5 b. x < 5 c. x > 18 d. x < 35 e. x > 36 The correct answer is c. I get to the point where x>35. Now, how is it that x>18 is a must? If x>35, shouldn't x be anything but smaller than 35, which would make "e" a c...

by godemol

Sun Aug 09, 2009 10:32 pm
Forum: Data Sufficiency
Topic: number property q.
Replies: 3
Views: 1087

probability Q.

Guys, a simple question, but I am having hard time grasping. Need your help: The events A and B are independent. The probability that event A occurs is p and the probability that event B occurs is q. Which of the following is equal to the probability that exactly one of the events A and B occurs ? A...

by godemol

Sun Aug 09, 2009 9:29 pm
Forum: Data Sufficiency
Topic: probability Q.
Replies: 1
Views: 674

algebra simultaneous question

The following is question #70 from OG 12th: Mary persuaded n friends to donate $500 each to her election campaign, and then each of these n friends persuaded n more people to donate $500 each to Mary's campaign. If no one donated more than once and if there were no other donations, what was the valu...

by godemol

Fri Jul 31, 2009 8:42 am
Forum: Data Sufficiency
Topic: algebra simultaneous question
Replies: 2
Views: 1103