Candy boxes

You have to create as many identical candy boxes as possible from 280 orris, 252 nougat, and 420 marzipan candies. At the same time, you must not have any candy left or missing. What will be the composition of one box of chocolates, and how many candies will you prepare from the given amount?

Correct answer:

a =  10
b =  9
c =  15

Step-by-step explanation:

$$\begin{gathered} 280=2^3\cdot 5\cdot 7 \\ 252=2^2\cdot 3^2\cdot 7 \\ 420=2^2\cdot 3\cdot 5\cdot 7 \\ \text{GCD}(280,252,420)=2^2\cdot 7=28 \\ D=GCD(280,252,420)=28 \\ a=280/D=280/28=10 \end{gathered}$$

$b=252/D=252/28=9$

$c=420/D=420/28=15$

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