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 result:

z =  18

Solution:

z/3=c/4 4z=3c c=24  z=c⋅ 34=24⋅ 34=18

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