... Fifth 28. The numbers, 3-7-2-4-8-1 -5, are read backwards as …………… Answer: 5- 1-8-4-2-7-3.3 29. The odd numbers in this group add up to an …. Number: 15, 32, 5, 13, 82, 7. Answer: Even 30. This ... building an open-ended (straight) fence by stringing wire between posts 25 metres apart. If the fence is 100 metres long how many posts should the rancher use? Answer: 5 18. 11. If the day before ... number should come next in the series 1, 3, 6, 10, 15 , ……… Answer: 21 20. Which number should come next in the series? 13, 57 , 911, 13 15, 1719 Answer: 2123 21. If two typists can type...