The grocery

Susan has decided to make grocery combos for her shop. The wholesaler she buys from sells sugar in packets of 20 in a carton, flour in packets of 12 a carton, and 15 bags of rice in a carton. How many of each item should she buy so there are an equal number of sugar packets, flour, and bags of rice in each combo?

Correct answer:

a =  3
b =  5
c =  4

Step-by-step explanation:

$$\begin{gathered} 20=2^2\cdot 5 \\ 12=2^2\cdot 3 \\ 15=3\cdot 5 \\ LCM(20,12,15)=2^2\cdot 3\cdot 5=60 \\ x=LCM(20,12,15)=60 \\ a=x/20=60/20=3 \end{gathered}$$

$b=x/12=60/12=5$

$c=x/15=60/15=4$

Try another example