Tom makes a scale drawing of a statue using the scale 1 cm: 5 ft. His drawing measures 16 cm. Mary makes a scale drawing of the same statue, but uses the scale 1 cm: 4 ft. How many centimeters tall is the statue on Mary's drawing?

20 cm

Step-by-step explanation:

1 cm of Tom's drawing is 5 ft of the statue

So his 16 cm drawing is

1 cm of Mary's drawing is 4 ft of the statue

1 ft of the statue is of the drawing.

So, 80 feet of the statue is of the drawing.

Hence, Mary's drawing is 20 cm tall.

so, converting firstly the mixed fractions to improper fractions and then "adding".