If a bat and a ball together cost $1.10, how much does

the ball cost if the bat is $1.00 more than the ball?

If 5 machines can make 5 widgets in 5 minutes, how

long will it take for 100 machines to make 100

widgets?

If the lily ponds growing on a pond double in area

every day, and it takes 48 days to cover the whole

pond, on what day will the lily pads cover half of the

pond?