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Bankers adda latest material on percentages

Banker's adda - bankersadda quant and reasoning material1) In a lottery, there are 5 prizes and 10 blanks in tickets. A ticket is drawn at random. What is the probability of getting a prize?   1 1/7-    2) 2/7   3) 1/3   4) 2/3  5) None of these 
2) In a class, there are 15 boys and 10 girls. Three students are selected at random. The probability that one girl and two boys are selected is  1) 4/25  2) 25/117   3) 1/3   4) 21/46  5) None of these 
3) The price of 8 chairs is equal to 3 tables. The price of 12 chairs and 5 tables together is Rs. 1,520. What is the total price of 10 chairs and 5 tables?  1) Rs. 1500   2) Rs. 1480   3) Rs. 1400   4) Rs. 1360   5) None of these 
4) Rohit starts a business with Rs. 6,500 and after 8 months Shyam joins Rohit as his partner. After 4 years the profit is divided in the ratio of 13 : 12. What is Shyam's contribution in the capital? 1) Rs. 7400   2) Rs. 7200   3) Rs. 7250   4) Rs.7630   5) Rs.7480