Joe has 16 more baseball cards than football cards. he also noticed that of the total he has three times as many baseball cards as football cards. how many football cards does he have?

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?