The combinations of sizes allow him to empty the bathtub in exactly four trips is a 5-liter bucket with the 3-liter bucket twice, a 3-liter bucket and the 4-liter bucket.
The unitary method is a method for solving a problem by the first value of a single unit and then finding the value by multiplying the single value.
Paul's bathtub is clogged. He has to empty 30 liters of water by hand.
Paul has a 3-liter, a 4-liter, and a 5-liter bucket.
If Paul carries two buckets each trip, we need to find the combinations of sizes that allow him to empty the bathtub in exactly four trips.
5 and 3 = 8 liters ,
5 and 4 = 9 liters,
3 and 4 = 7 liters.
8 + 7 + 8 + 7 = 30 liters,
So,
He can take the 5-liter bucket with the 3-liter bucket twice, and then he can use the 3-liter bucket and the 4-liter bucket twice.
Learn more about the unitary method;
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