Rhys is arranging a raffle for a school fair. The tickets cost
50p each.
The main prize of the raffle is
£20. The second prize is £5.
How much profit will Rhys make if he manages
to sell 140 tickets?

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min