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Probs from 1000 DS set :Explanations Reqd
by shriks aditya - Saturday, 28 August 2010, 11:29 PM

. Last Tuesday a trucker paid $155.76, including 10 percent state and federal taxes, for diesel fuel. What was the price per gallon for the fuel if the taxes are excluded?

(1) The trucker paid $0.118 per gallon in state and federal taxes on the fuel last Tuesday.

(2) The trucker purchased 120 gallons of the fuel last Tuesday



. If x0, is |x| <1?

(1) x2<1

(2) |x| < 1/x


Re: Probs from 1000 DS set :Explanations Reqd
by vaibhav sharma - Saturday, 4 September 2010, 12:32 PM

Plz explain

2>.    x^2 - 1 < 0

       (x-1)(x+1) < 0

i.e. x will lie between -1 and +1 and i think its sufficient.

Re: Probs from 1000 DS set :Explanations Reqd
by rajwinder singh - Friday, 8 October 2010, 09:06 PM
  vaibhav..... u cannot take x on the othr side as u don't know what is the sign of x,because if x is negative then the symbol will change i.e x^2-1 will become greater than zero....that'z why it is insufficent............upar waala data is also,the answr is ,both the data is insufficent.....