GRE Exam Numerical Ability Quadratic Equations

If Robert writes coefficient of x incorrectly, while writing a quadratic equation and finds the roots as -2 and 8. Steven makes a mistake in writing the constant term and finds the root as 3 and 9. Find the correct equation.
(A) x²-12x-16=0 (B) x²+12x-16=0 (C) x²-12x+16=0 (D) x²+12x+16=0

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GRE Other Question

A hose starts filling an empty tank at 6 am and can fill it completely by 10 am. But due to leakage at the bottom of the tank, 1/3 rd of the tank would still remain empty by 10 am. Now if leakage is stopped at that time, at what time will the tank be filled by this hose ? (A) 11.30 am (B) 11.20 am (C) 11.40 am (D) 11.50 am Tate can develop specific software in 15 days, while Kate takes 30 days to complete it. However Tate do not have more than 3 days to devote, therefore he works along with Kate for only first 3 days of the project and leaves Kate to finish the project on his own. Find how many days will Kate need to finish the project now ? (A)20 (B)24 (C)22 (D)21