Sausages come in packets of 9. Bread rolls come in packets of 6. Colin wants to buy enough packs of sausages and rolls so that there are an

lcm(9, 6) = 18

 

So our answer is 18 sausages and 18 rolls. :))

Here's a video if you need to learn how to find the lcm: https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-factors-and-multiples/cc-6th-lcm/v/least-common-multiple-exercise 

 

=^._.^=