Napkins

Viera and Darina exchanged napkins. Always 3 yellow for 4 red napkins. How many yellow napkins will Viera receive for 24 red napkins?

Correct answer:

z =  18

Step-by-step explanation:

$$\begin{gathered} z\mathrm{/}3=c\mathrm{/}4 \\ 4z=3c \\ c=24 \\ z=c\cdot {\displaystyle \frac{3}{4}}=24\cdot {\displaystyle \frac{3}{4}}=18 \end{gathered}$$

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