A 6-pack of fruit juice costs $2.76. At that same rate, how much would a 15-pack cost

A 15 - pack would cost $6.90.

Explanation:

We know that a 6-pack of fruit juice would cost 2.76, so to find the cost of 1 - pack, you divide 2.76 by 6. That gives us $0.46 for 1 - pack. To find the cost of a 15-pack, you would multiply $0.46 by 15, which gives us $6.90. Therefore, a 15 - pack would cost $6.90