16. The sum of a series of 5 consecutive odd numbers is 195. The second lowest number of this series is 5 less than the second highest number of another series of 5 consecutive even numbers. What is 40% of the second lowest number of the series of consecutive even numbers?
1) 16.8
2) 18.8
3) 19.4
4) 17.6
5) 15.2
17. The sum of the dimensions of a room (ie length, breadth and height) is 18 meters and its length, breadth and height are in the ratio of 3 : 2 : 1. If the room is to be painted at the rate of Rs 15 per m 2, what would be the total cost incurred on painting only the four walls of the room (in Rs)?
1) 3250
2) 2445
3) 1350
4) 2210
5) 2940
18. B is 4/3 times as efficient as A. If A can complete 5/8 of a given task in 15 days, what fraction of the same task would remain incomplete if B works on it independently for 10 days only?
1) 3/4
2) 2/3
3) 5/8
4) 4/9
5) 2/3
19. In a class, the average weight of 60 boys is 64 kg and that of 75 girls is 70 kg. After a few days. 60% of the girls and 30% of the boys leave. What would be the new average weight of the class (in kg)?
Assume that the average weight of the boys and the girls remains constant throughout.
1) 63
2) 66.5
3) 68.5
4) 65.5
5) 57.5
please provide some hints , it will be greatfull
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