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Math problem 2: Smiling faces can be exchanged for six moons, four moons can be exchanged for eight stars, and five smiling faces can be exchanged for how many stars?
30

Two smiling faces can be exchanged for six moons, so 1 smiling face = three moons;

Four moons can be exchanged for eight stars, so 1 moon =2 stars;

It can be deduced that 1 smiling face =6 stars.

5 smiling faces =30 stars

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