Search found 10 matches
This is what the question i had in mind, after going thru the answers. This is one real tough word translation for me. why we are adding and subtracting the stream speed for downstream and upstream respectively? This is a case of relative velocity(speed) here, When we do downstream , which means fl...
- by mbaonmind
Thu Jun 07, 2012 11:39 am- Forum: Problem Solving
- Topic: down the rivers
- Replies: 13
- Views: 8158
There is one way called differentiation, the expression is 2x^2 +3y^2-4x-12y+18 If I differentiate with respect x and equate to 0 i get 4x-4 = 0 i.e. x = 1; If I differentiate with respect y and equate to 0 i get 6y-12 = 0 i.e. y = 2 when substituted x = 1, y = 2 we get expression value as 4 Thus An...
- by mbaonmind
Mon Jul 26, 2010 10:19 pm- Forum: Problem Solving
- Topic: Minimum value of an expression
- Replies: 65
- Views: 40447
Selma and Miriam are racing their sailboats from Miami,Florida to Georgetown, Grand Cayman. The loser must buy the first round of drinks at their favorite beach bar. At 1 P.M., Selma passes a cruise ship that is anchored 160 miles away from Georgetown. Selma is traveling at 20 miles per hour. At 2 ...
- by mbaonmind
Sat May 29, 2010 11:38 am- Forum: Problem Solving
- Topic: race
- Replies: 3
- Views: 1634
At 1:00 The small angle is 30 degree
in 1 hour
hour hand moves 30 degrees and
minutes hand moves 360 degree
Therefore in next 50 minutes
hour hand moves 25 degree and
minutes hand moves 300 degree
At 1:50 the small angle is 115 degree.
- by mbaonmind
Sat May 29, 2010 5:00 am- Forum: Problem Solving
- Topic: when it strikes
- Replies: 3
- Views: 1395
Standard deviation shows how much variation there is from the "average" (mean). 1. A low standard deviation indicates that the data points tend to be very close to the mean, 2. A high standard deviation indicates that the data are spread out over a large range of values. you need both info...
- by mbaonmind
Wed Apr 21, 2010 1:10 am- Forum: Data Sufficiency
- Topic: ds
- Replies: 4
- Views: 1267
sure you take up any number that differ by 20
e.g 111 and 131 or
125 and 145
using above formulae f(m) = 9f(v) always where m < v
[/quote]
- by mbaonmind
Tue Dec 15, 2009 4:49 pm- Forum: Problem Solving
- Topic: m - v = ?
- Replies: 7
- Views: 1622
If m and v are three-digit positive integers Let m = xyz v = abc since f(m) = 9 f(v) 2^x 3^y 5^z = 9(2^a 3^b 5^c) = 2^(x-a) 3^(y-b) 5^(z-c) = 9 since 9 is a multiple of 3 we can deduce that x-a = 0 y-b = 2 z-c = 0 hence m-v = 20 :)
- by mbaonmind
Mon Dec 14, 2009 7:37 pm- Forum: Problem Solving
- Topic: m - v = ?
- Replies: 7
- Views: 1622
- by mbaonmind
Mon Dec 14, 2009 3:19 am- Forum: Problem Solving
- Topic: 1 2 3 3 2 1 4 2 3 1 4 2 2 3 3 1 4 1 1 3 2 3 4
- Replies: 3
- Views: 1791
- by mbaonmind
Mon Dec 14, 2009 3:18 am- Forum: Problem Solving
- Topic: Bailey stayed with Nakesha?
- Replies: 3
- Views: 1344
- by mbaonmind
Fri Aug 21, 2009 10:54 am- Forum: Critical Reasoning
- Topic: happiness
- Replies: 3
- Views: 1778