Question

David can pack 132 cartons of jar in one day and his assistant Mark works one quarter as fast as david does. How many days would it take both of them working together to pack 660 cartons?
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Answer 1

4 days is needed to pack 660 cart

Answer 2

David can pack 132 cartons of jar in one day and his assistant Mark works one quarter ( 1/4)  as fast as David does.

David produces 132 cartoons in 1 day

Mark produces 1/4 of 132 = 33 cartoons in a day 

They both produces (132+33) = 165 cartoons in a day. 

To produce 660 cartoons, it will take: 
 
660 ÷ 165 = 4 days