Polya's step four problem solving examples​

1 decimeter = 0.33 ft

1 hectometer = 330 ft

1 centimeter = 0.033 ft

1 milimeter = 0.0033 ft

1 kilometer = 3300 ft

1 dekameter = 33 ft

How many students were; into swimming but not in badminton?

50

into badmiton but not in swimming?

25

into both badminton and swimming?

25