GRE Exam Numerical Ability Time and Work

Working alone at their respective constant rates, A can complete a task in ‘a’ days and B in ‘b’ days. They take turns in doing the task with each working 2 days at a time. If A starts they finish the task in exactly 10 days. If B starts, they take half a day more. How long does it take to complete the task if they both work together?
A. 46/9 B. 50/9 C. 50/11 D. 36/7 E. 210/41

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GRE Other Question

If x is a positive integer such that (x-1)(x-3)(x-5)....(x-93) < 0, how many values can x take?
A. 47 B. 23 C. 46 D. 21E. 22
Last year Kate spent between 1/4 and 1/3 of her gross income on her mortgage payments. If Kate spent $13,470 on her mortgage payments last year, which of the following could have been her gross income last year? Indicate all possible values.
A $40,200 B $43,350 C $47,256 D 51,996 E $53,808