Dimensional Analysis ?

Question

The info apply science catalog:

60 rubber stoppers= 500.0grams = $4.89

Each student in a class will need 4 stoppers. There are 24 students in the class. What mass of stoppers must be ordered and what will be the cost?

Answer 1

The two dimensions you will use are

500.0 grams /60 rubber stoppers and

$4.89 /60 rubber stoppers

because the stoppers are sold in units (perhaps bag or boxes) of 60 rubber stoppers each.

24 students * 4 stoppers = 96 stoppers

One unit of 60 is not enough, two units would be 120.  This is enough.

(500.0 grams /60 stoppers) * 120 stoppers = 1000 grams.

($4.89 /60 stoppers) * 120 stoppers = $9.78