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nehareddy4u



Joined: 23 Jul 2010
Posts: 66
PostPosted: Thu Jul 29, 2010 5:06 pm    Post subject: Reply with quote

pravita wrote:
can some1 explain me question no 4


assume the radius of big circle as "r"..
then the small radius in terms of r = r/3..

so area of big circle = (pi) r^2

and small circle= (pi) (r/3)^2.. there are 7 so ==> 7/9 * (pi) r^2..

unshaded region = (pi) r^2 - 7/9 (pi)r^2 ==> 2/9 (pi) r^2

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anksh22



Joined: 27 Jul 2010
Posts: 10
PostPosted: Fri Jul 30, 2010 6:44 pm    Post subject: 13th qu Reply with quote

sombdy plz explain me 13th question....

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nehareddy4u



Joined: 23 Jul 2010
Posts: 66
PostPosted: Sat Jul 31, 2010 9:31 pm    Post subject: Re: 13th qu Reply with quote

anksh22 wrote:
sombdy plz explain me 13th question....




13. Given that a person A takes 20mins to finish a work and person B takes 25mins to finish the same work. If they both work together, how much will they take to complete the same work?

take 1 day work :
A can do work in 1/20..
B can do work in 1/25..

so A & B = 1/20 + 1/25 ==> 9/100.. (its 1 day work of both)..

so will finish the work in 100/9..

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sanket



Joined: 10 Mar 2010
Posts: 1
PostPosted: Sun Aug 01, 2010 1:49 am    Post subject: Reply with quote

can someone explan how did you get the 5th and the 6th??

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