Y varies directly with x, when x= 12.5, y = 30. find y when x=32

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

You are cycling around europe with friends. a cycling festival is starting soon in barcelona. it will take 4.5 hours to cycle there. how many minutes in total is this?

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?