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#1 Re: Ganesh's Puzzles » Oral puzzles » 2006-04-19 14:43:58

121. 4*6*4*4 ( assuming he won't go to the party without his shirt and trousers )
122. Brian takes 45/15 = 3 hrs. In this time D covers 3 x 20 = 60 Kms
123. 40/(Pi-2)

#2 Re: Ganesh's Puzzles » Oral puzzles » 2006-04-19 14:37:44

124. 26
125. 4:sqrt(3)
126. 2
127. 8:27
128. 7.5
129. 4 ( not counting the case when it is left as it is )
130. -9
131. 8
132. 25
133. 2*pi*r^^3

#4 Re: Ganesh's Puzzles » Oral puzzles » 2006-04-05 00:21:52

***49. Area of pathway = (x+4)*(y+4) - xy = 4x + 4y + 16

#12 Re: Ganesh's Puzzles » *** Problems » 2006-03-20 03:41:25

***15
The diagonals of a parallelogram bisect each other. So y=2x+c must pass through middle of the opposite vertices - (3,2). On substituting, we get c = -4.
Let us say that vertices are (x,y) the angle between two lines from (x,y) to the other 2 vertices should be 90. Which is true if and only if m1 X m2 = -1. Using this and y=2x-4, we get the other vertices as (2,0) and (4,4)

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