This is a more complicated ratio problem which can be solved with the unknown multiplier technique.

We want to know how many lobsters bought were worth $5,-. (5x). This means the amount of lobsters bought that were worth $4,- are 25-x.

Set up the equation as follows:

5x + 4(25-x) = 112

x = 12

5*12 = 60

60/5 = 12.

Hence, 12 lobsters were bought that were worth 5 bucks.

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