Answer:
21
Explanation:
given : 2 triffles = 7
6 / 2 = 3 so miutiple both side by 3
2 x 3 = 6 and 7 x 3 = 21
6 triffles = 21
OR
Find the cost of 1 triffle:
7 / 2 = 3.5
1 triffle = 3.50
3.50 each x 6 triffles = 21
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