Two persons could fit the AC unit in a house in 2 days one person fell ill before the work started, how long would the job take now?

7 A batch of tablets were packed in 10 boxes with 6 tablets in each box. If the same batch is packed using 12 tablets in each box. How many boxes would be needed? 8 In a toy company, it requires 36 machines to produce a car toys in 54 days. How many machines would be required to produce the same number of car toys in 81 days?  10 In a college 7 period a day each of 45 minutes duration. How long each period be, if the school has 9 periods a day assuming the number of hours to be the same? 11 There are 200 students in a primary school. They need 50 litres of drinking eater/day. If 50 of them are reduced how many litres of water needed per day?