The entire pie as seen in the picture is divided among children. Each child receives a piece of the pie with three cherries on top. How many children are there?
Brian and William stand in a line. Brian knows that there are 7 people in front of him. William knows that there are in total 11 people in the line. If Brian is just in front of William, how many people in the line are behind William?
In Old McDonald’s barn there are one horse, two cows and three pigs. How many more cows does Old McDonald need so that there are twice as many animals as cows?
A kangaroo makes 10 jumps in 1 minute then rests for 3 minutes. Then he makes 10 jumps in 1 minute and rests for 3 minutes, and so on. At least, how many minutes does he need to make 30 jumps?