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Like this PageCLICK this button to recommend this page to Google. GRE Practice TestGRE Practice: Problem Solving GRE Practice Test 2Powered by GreGuide Version 2.2.1 Copyrights 2007, GreGuide.com Question: 1 If the roots of the equation ax^2+cx+b=0 be equal, then which of the following is the correct value of b? Indicate the correct option. [x^2=x*x]
Correct Answer: E Explanation: For the roots to be equal, the discriminant has to be zero. c^{2}-4*a*b=0 c^{2}=4ab b=c^{2}/4a Option E is correct. Question: 2 Alice can knit a sweater in 30 days, Laura in 20 days and Sandra in 60 days. How many days will they take to knit the sweater if they share their work? Indicate the correct option.
Correct Answer: B Explanation: Work done by Alice in one day = 1/30 Work done by Laura in one day = 1/20 Work done by Sandra in one day = 1/60 Work done by them working together in one day = 1/20+1/30+1/60 = (3+2+1)/60 = 6/60=1/10 Time taken to compete the work = 10 days Option B is correct. Question: 3 A boat takes 6 hours to go downstream and upstream a certain distance. It takes 4 hours to travel twice the distance downstream. Which of the following is the ratio of the speed of the boat in still water to the speed of the river? Indicate the correct option.
Correct Answer: A Explanation: Let the speed of the boat in still water be x and the speed of the river be y Speed upstream = x-y Speed downstream = x+y Let the distance travelled be D Time = Distance/Speed D/(x+y) + D/(x-y) = 6 and 2D/(x+y) = 4 Putting D/(x+y)=2 ...(1) in the first relation, we get 2 + D/(x-y) = 6 D/(x-y) = 4 ...(2) From (1) and (2), we get (x+y)/(x-y) = 4/2 = 2 x+y=2x-2y x-2x=-2y-y -x=-3y x/y = 3/1 Option A is true. Question: 4 Which of the following is equal to 2% of 22% of 222? Indicate the correct option.
Correct Answer: E Explanation: 2% of 22% of 222 = 2% of 22*222/100 = 2% of 48.84 = 0.9768 Option E is correct. Question: 5 Which of the following is the average of the first 10 even numbers? Indicate the correct option.
Correct Answer: C Explanation: The numbers are 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 Average = (2+4+6+8+10+12+14+16+18+20)/10 = 10 Like this PageCLICK this button to recommend this page to Google. Spread The Word / Bookmark this content Digg this Post to del.icio.us Post to Furl Post to Netscape.com
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