GRE Exam Numerical Ability Simple & Compound Interest

Nguyen had invested a total of $20,000 in two banks A and B. At the end of one year he realized that his interest amount from bank A was one and half times that from bank B. If his investment in bank A was three times as that in bank B and if he earned a total interest amount of $1,250 from the two banks then what is the interest rate in bank B ?
[A] 10% [B] 8 [C] 12% [D] 5%

Read Solution (Total 1)

Let the interest rate be "x%"
Therefore,
Interest amount of Bank A + Interest Amount of Bank B = Rs.1250
(5000*x*1)/100 + (15000*3x*1)/200 = 1250
50x + 225x = 1250
275x = 1250
x = 4.56%~5% (Option D)
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GRE Other Question

If mx + qy − nx − py = 0, p − q = 3, and x/y = -2/3 , then which of the following is true?
A) n + m = 9/2 B) n - m = 2 C) m + n = 2 D) m - n = -9/2 Roger and Robin live 190 miles apart. They both drive in a straight line toward each other to meet for lunch. If Roger drives at 50 mph and Robin drives at 70 mph, then how many miles apart will they be exactly 45 minutes before they meet?