Explain the meaning of the following: A scale on a map is 1 cm to 20 mi.

4x 20 is 80 but if ther machine is broken then there is none you have to redo the test

If i think this is what your asking, he should look at the grams or pounds/ounces and compare the to their cost then max can identify which one is proportional and which is not ( i think xd)