Answer:
The price for each pound of tuna is the same. Each pound costs $5. For 10 lbs of tuna, it would be $50.
Explanation:
For these kind of questions, you can either find the pattern in the information given or you find the unit price.
Pattern: Check the numbers to see if there are any patterns happening. 3 mutlpiled by 5 gets you 15, 7 muliplied by 5 gets you 35, and 9 multipled by 5 gets you 45.
Unit Price: You would need to find the price for one item, or in this case, one pound. If 3 lbs is $15 dollars you would do 15/3, 15 divided by 3/total price divided by pounds, so you would get $5. You can also change the denominator to 1 and to do this you would divide the 3 by 3 to get 1 and what you do to the bottom, you do to the top so you also divide 15 by 3 and you would get 5. In conclusion, 5/1 which is 5 dollars for one pound.
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The arrows represent the number it goes in btw. I'm not too good with explaining things so let me know if you need clarifications on anything and I also personally recommend the unit price method since it isn't easy to spot a pattern with harder questions. Tell me if I'm wrong please so I can go back and look:)