Question

pencils come in packages of 10. Erasers come in packages of 12. phillip wants to purchase the smallest number of pencils and erasers so that he will have exactly 1 erasers per pencil. how packages of pencils ad erasers should phillip buy?

Answer 1

120 packages of pencils and erasers. 120 is the GCF. 10 × 20 = 120

Answer 2

The answer isn't 120 but it is 60 because it asks for the LCM  not GCF because 60 goes into 12 and 10 as well.