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m25 Q9

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m25 Q9 [#permalink] New post 06 Jan 2010, 02:05
Can someone plz help me explain how to solve this...

thanks

If the productivity of a brigade grows by 10% when the number of the workers in the brigade is increased by one, then which of the following is closest to the ratio of the productivity of a 12-person brigade to that of a 10-person brigade?

(A) 0.21
(B) 0.82
(C) 1.20
(D) 1.21
(E) 1.44

Answer is D.
Senior Manager
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Re: m25 Q9 [#permalink] New post 06 Jan 2010, 05:40
take prod of 10 person be x..
so of 11 people it will be 1.1x.. and 12 people=1.1x*1.1=1.21x..
reqd ratio=1.21x/x=1.21
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Re: m25 Q9 [#permalink] New post 10 Jan 2010, 05:15
chetan2u wrote:
take prod of 10 person be x..
so of 11 people it will be 1.1x.. and 12 people=1.1x*1.1=1.21x..
reqd ratio=1.21x/x=1.21


I still dont understand the 12pep part..
Q says, 10% increase by one number increase then for 12pep isnt it suppose to be,
1.1x*0.1=?
could you please explain me how you came up with dividing by 1.1??!!

thanks
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Re: m25 Q9 [#permalink] New post 10 Jan 2010, 06:27
gmatJP wrote:
chetan2u wrote:
take prod of 10 person be x..
so of 11 people it will be 1.1x.. and 12 people=1.1x*1.1=1.21x..
reqd ratio=1.21x/x=1.21


I still dont understand the 12pep part..
Q says, 10% increase by one number increase then for 12pep isnt it suppose to be,
1.1x*0.1=?
could you please explain me how you came up with dividing by 1.1??!!

thanks

hi ..if with each person increased , prod increases by 10%...
1.1x*0.1 gives you the increase,which is 10% of the prod of 11 people but to get total we have to add these incr to prod of 11 person =1.1x+.11x=1.21x..
Re: m25 Q9   [#permalink] 10 Jan 2010, 06:27
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