Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

Q: Problem: 2.205 divided by 0.3 gives
Options: a. 7.35, b. 6.25, c. 8.15, d. 6.95, e. none of these

A: a
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Q: Problem: the number of the members of a club is more than 50 and less than 80. when 4 people sit at a table, other people exactly divided to 8 - people groups ( 8 people sit at a table. or 7 - people groups ( 7 people sit at a table.. if the members are divided to 9 - people groups, how many people will be left ?
Options: a. 0, b. 2, c. 4, d. 6, e. 8

A: d
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Q: Problem: two brother x and y appeared for an exam. the probability of selection of x is 1 / 3 and that of b is 2 / 7. find the probability that both of them are selected.
Options: a. 2 / 69, b. 2 / 21, c. 2 / 23, d. 2 / 29, e. 2 / 10

A:
b
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