Search found 3 matches
B/C = 2/23
B = C - 630
Solve both to arrive at the answer.
(C-630)/C = 2/23
1 - 630/C = 2/23
230/C = 21/23
C = 630*23/21 = 690
- by iwillmakeit
Sat Mar 01, 2008 9:55 pm- Forum: Problem Solving
- Topic: PS Ratio Problem
- Replies: 9
- Views: 7538
D take a look at integer sequence: 1,2,3,4,5,6,7, 8 ,9,10,11,12,13,14,15, 16 ,17,18,19 to catch 8*n we have to start with 8n-2, 8n-1, 8n 1,2,3,4,5, [6,7, 8 ],9,10,11,12,13,14,15, 16 ,17,18,19 1,2,3,4,5,6, [7, 8 ,9] ,10,11,12,13,14,15, 16 ,17,18,19 1,2,3,4,5,6,7, [ 8 ,9,10] ,11,12,13,14,15, 16 ,17,1...
- by iwillmakeit
Sat Mar 01, 2008 9:34 pm- Forum: Problem Solving
- Topic: Probabilty and Divisor
- Replies: 1
- Views: 1412
p=1-(4/7*1/6+3/7*2/6)=16/21
4/7 - the probability to choose one of 4 people who have 1 friend.
1/6 - the probability to choose a friend of 6 remained people
3/7 - the probability to choose one of 3 people who have 2 friend.
2/6 - the probability to choose a friend of 6 remained people.
- by iwillmakeit
Sat Mar 01, 2008 9:22 pm- Forum: Problem Solving
- Topic: Probability Question: How to tackle this faster?
- Replies: 4
- Views: 3261