He is making the step out of concrete. The concrete must be made up of $$ 1 \text { part cement: } 2 \text { parts water: } 3 \text { parts shingle. } $$ He uses a small bucket to measure each part. He estimates that he will need 18 buckets of concrete in total. How many buckets of shingle will he need?

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To solve this problem, we first need to determine the total number of parts in the concrete mixture. According to the given ratio, the concrete is made up of 1 part cement, 2 parts water, and 3 parts shingle. This means there are a total of 1 + 2 + 3 = 6 parts in the mixture.

Now, we know that he estimates he will need 18 buckets of concrete in total. Since the mixture is made up of 6 parts, each bucket of concrete will contain 18 buckets / 6 parts = 3 parts of the mixture.

Since the shingle is 3 parts of the mixture, and each bucket contains 3 parts, he will need 3 parts of shingle per bucket. Therefore, for 18 buckets of concrete, he will need 18 buckets * 3 parts of shingle per bucket = 54 buckets of shingle.
He will need 54 buckets of shingle.

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