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To make 7 bowls of punch, you need 5 bottles of soda. How many bottles do you need to make 12 bowls of punch?

Answer :

[tex] \frac{5}{7} = \frac{x}{12} [/tex]
[tex]5 \times 12 = 60[/tex]
[tex]60 \div 7 = 8.5[/tex]
Simple cross multiplication & division will give you the answer.