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backsolving
since we know 57 and 63 are both divisible by 3 we need to look in answer choices that are divisible by 3. it narrow downs to C. so why not start with C. 57 floors in 1 minute then 19 (30-11) floors in 1/3 minute. 63 floors in 1 minute then 21 (51-30) floors in 1/3 minute. Bingo....they will meet on...
- by nkanakiya
Wed Jul 15, 2009 10:10 am- Forum: Problem Solving
- Topic: Elevator ride
- Replies: 7
- Views: 4453
Line 1 Line 2 13 33 17 37 21 41 25 45 29 49 Last number on every line increases by 20..so on 9th line it will be 189 and will be 45th number. So 46th number will be 189+4 = 193...Bingo...
- by nkanakiya
Wed Jul 08, 2009 6:05 pm- Forum: Problem Solving
- Topic: Infinite Sequence
- Replies: 3
- Views: 1652