IBPS Government Jobs Exams Numerical Ability Probability

A box contains red, green and blue colored balls. When one ball is drawn randomly from the box, the probability that it is either green or blue is 2/3. Also, the probability that the ball drawn randomly from the box is either red or green is 3/5. When two balls are drawn randomly from the box, the probability that both balls are of green color is 1/15. Find the total number of balls in the box.
A) 15 B) 20 C) 30 D) 45 E) 60

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IBPS Other Question
What should come in place of question mark (?) in the following number series?
500, 435, 385, 348, ?, 305
A) 331 B) 333 C) 335 D) 337 E) None of these Present age of Vidya is five times present age of her daughter and five-sevenths of present age of her mother. The total of the present ages of all of them is 208 years. What is the difference between ages of Vidya and her mother?
A) 21 years B) 24 years C) 28 years D) 32 years E) Can not be determined