2716: The average salary of skilled employees in a firm is Rs. 520 and that of the unskilled employees is Rs. 420. If the average salary of both the groups of employees is Rs. 500, then the percentage of skilled employees in the firm is
(a) 50
(b) 20
(c) 80
(d) 70
2717: Standard 18-carat gold sold in the market contains:
(a) 82 parts gold and 18 parts other metals
(b) 18 parts gold and 82 parts other metals
(c) 18 parts gold and 6 parts other metals
(d) 9 parts gold and 15 parts other metals
2718: In a family, a couple has a son and a daughter. The age of the father is three times that of his daughter and the age of the son is half of his mother. The wife is nine years younger to her husband and the brother is seven years older than his sister. What is the age of the mother ?
(a) 40 years
(b) 45 years
(c) 50 years
(d) 60 years
2719: The time in the wall-clock is 3.25 the acute angle between the hours-hand and the minutes-hand is
(a) 60°
(b) 52 ½°
(c) 47 ½°
(d) 42°
2720: Parimarjan Negi has excelled which one of the following games ?
(a) Weightlifting
(b) Chess
(c) Billiards
(d) Swimming