Dave spent 21 minutes completing a race. He walked 9 minutes and jogged the rest. What is the ratio of time he jogged to time he walked?

There are 20 children in the cast of a class play and 8 of the children are boys of the boys 4 have a speaking part in the play and of the girls 8 do not have a speaking part in the play if a child from the cast of the place chosen at random what is the probability that the child has a speaking part

Long division the problem is 40 ➗ 348 = ?

When y’all answer can y’all explain too !