The butterfly costs 6 rub. How much are 3 same butterflies and examples on examples, which above

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6*3=18 rubles are cost by three such butterflies 3*2=6 18:6=3 18:2=9 1:1=1 18:18=1 9:1=1 21-18=3 12:2=6 27:3=9 1*1=1 18:3=6 1*3=3 21:7=3 18-12=6 27-26=1 15-6=9
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