GRE Exam Numerical Ability Time and Work

Working at their respective constant rates, machine I makes 240 copies in 8 minutes and machine II makes 240 copies in 5 minutes. At these rates, how many more copies does machine II make in 4 minutes than machine I makes in 6 minutes?
(A) 10
(B) 12
(C) 15
(D) 20
(E) 24

Read Solution (Total 1)

(B) 12

Copies by machine II in 4 min. - Copies by machine I in 6 minutes=240*4/5 - 240*6/8=192-180=12
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GRE Other Question

Among the people attending a convention in Europe, 32 percent traveled from Asia and 45 percent of those who traveled from Asia are women. What percent of the people at the convention are women who traveled from Asia? Each month, a certain manufacturing company’s total expenses are equal to a fixed monthly expense plus a variable expense that is directly proportional to the number of units produced by the company during that month. If the company’s total expenses for a month in which it produces 20,000 units are $570,000, and the total expenses for a month in which it produces 25,000 units are $705,000, what is the company’s fixed monthly expense?
(A) $27,000
(B) $30,000
(C) $67,500
(D) $109,800
(E) $135,000