1/6 of an hour is equivalent to 10/60 or 10 minutes. To find out how much 3/4 of an hour is, change the denominator of both fraction so that they match up. We can make this easier by multiplying 4 by 15 to get 60 (hence an hour) and since we multiplied 4 by 15, we also need to multiply 3 by 15 which gets us 45. We end up with 10/60 and 45/60 or 10 minutes and 45 minutes. Half of 10 is 5 so we know we'll have a decimal of .5 in our answer. 4 times 10 equals 40 and 40 plus 5 equals 45, so 4.5.
I think that there are 2 children in the group because if you divide 568 by 16 you will get 35.5. Multiply 35 by 16 and you get 560. Subtract 16 from 560 you get 544 + 12+12 = 568
