Search found 7 matches
Work problem is my concern, too. I found an easier way to approach this kind of problem. If it takes M workers H hours to finish a job, then each worker does 1/MH of the job in an hour. So the rate of each worker is 1/MH. ---------------------- Apply this to your problem: Five farm workers can pick ...
- by vpmba2009
Sat Jun 13, 2009 8:57 am- Forum: Problem Solving
- Topic: Work problem # 2
- Replies: 7
- Views: 2309
Assume we have 120 students last year Number of students last year Number of students left Number of students remain Biology 60 (1/2) 20 (1/3 of 60) 40 (60-20) Chemistry 40 (1/3) 10 (1/4 of 40) 30 (40-10) Physics 20 0 20 Total 120 90 fraction of all students took biology and took chemistry = (40+30)...
- by vpmba2009
Fri Jun 05, 2009 8:49 am- Forum: Problem Solving
- Topic: Difficult Math Question #39 - Sets
- Replies: 3
- Views: 2592
- by vpmba2009
Thu Jun 04, 2009 8:55 am- Forum: Problem Solving
- Topic: work and rate
- Replies: 6
- Views: 1767
We have 15 number, x1, x2....x15
We need to find x1 and x15
We know that the median is x8=25 => x1= 25-7 = 18
We know that x15 -x1 = 25 (*)
Replace x1 = 18 into (*) we have x15 - 18 = 25
Thus x15 = 25 + 18 = 43
- by vpmba2009
Wed Jun 03, 2009 10:06 am- Forum: Problem Solving
- Topic: a range of 25 and a median of 25
- Replies: 6
- Views: 5783
- by vpmba2009
Wed Jun 03, 2009 9:51 am- Forum: Problem Solving
- Topic: Sequence
- Replies: 12
- Views: 2758
"x meters per second is equivalent to the speed of y kilometers per hour"means x/1"second" = y/1 "hour" (*) We know that 1kilometer = 1000 meters and that 1 hour = 3600 seconds Therefore, (*) can be written as x/1000 * 1"second" = y/3600 seconds => y=3600x/100...
- by vpmba2009
Wed Jun 03, 2009 9:40 am- Forum: Problem Solving
- Topic: Gmat prep 1 Ques
- Replies: 9
- Views: 1831
The numbers ranges from 123 to 923 x23: 9 numbers (x range from 1 to 9) x32: 9 numbers (x range from 1 to 9) 23x: 10 numbers (x range from 0 to 9) 32x: 10 numbers (x range from 0 to 9) 2x3: 10 numbers (x range from 0 to 9) 3x2: 10 numbers (x range from 0 to 9) -------------- Total: 58 numbers => ans...
- by vpmba2009
Wed Jun 03, 2009 8:58 am- Forum: Problem Solving
- Topic: How many 3 digit numbers?
- Replies: 7
- Views: 6248