6 1/3 - 7 1/4 + 9 1/2 - 2 1/4 = .......................?
Choose the higher one
Choose the rational number which lies between 3/5 and 7/8
Find the odd one 6, 9, 15, 21, 24, 28, 30
39 persons can repair a road in 12 days, working 5 hours a day. In how many days, will 30 persons working 6 hours a day, complete the work ?
The average of 20 numbers is zero; of them, at most how many may be greater than zero?