UPSC CSE 2018 PRELIMS CSAT Part 35 AS EXAM Indian Administrative ServicesBY: AAKRITI
36. A bag contains 15 red balls and 20 black balls. Each ball is numbered either 1 or 2 or 3 20% of the red balls are numbered 1 and 40% of them are numbered 3. Similarly, among the blaclk balls, 45% are numbered 2 and 30% are numbered 3. A boy picks a ball at random. He wins if the ball is red and numbered 3 or if it is black and numbered 1 or 2. What are the chances of his winning? (b) 4/7 (c) 5/9 (d) 12/13
Total = 35 45% =2,25%=1 loo 3 00 3s 00 3S
37. Two persons, A and B are running on a circular track. At the start, B is ahead of A and their positions make an angle of 30 at the centre of the circle. When A reaches the point diametrically opposite to his starting point, he meets B. What is the ratio of speeds of A and B, if they are running with uniform speeds? (a) 6:5 (b)4:3 (d) 4:2
Solutia A 130 360 So, Rat t Speed 130 180 tso
38. 19 boys turn out for playing hockey. Of these, 11 are wearing hockey shirts and 14 are wearing hockey pants. There are no boys without shirts and pants. What is the number of boys wearing full uniform? (a) 3 (b) 5 (c) 6 (d) 8
Solutia s weRY (11 + 14-)-19
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