Marion is making trail mix for a group camping trip. She buys 3 pounds of granola for $3 per pound and 0.75 pounds of raisins for $2 per pound. What equation can you use to find the price per pound of the trail mix?

The total cost is the cost of the granola plus the cost of the raisins: 3 × $3 + 0.75 × $2. The total weight is 3 + 0.75 pounds. If x is the price per pound of the trail mix, then total cost equals total weight times price per pound, giving 3(3) + 0.75(2) = (3 + 0.75)x. This is choice B.

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