How many buckets will you need to build?

• A. One
• B. Three
• C. Four
• D. Two

Answer: (A)

The main idea here is whether you truly need more than one container to carry out the building steps. If every phase can be done using the same bucket—mixing, moving, and combining materials in that single container and then reusing it for the next step—there’s no need to have extra buckets. You can reuse the same bucket after each stage, cleaning or pouring as required, so all work can be completed with just one bucket. Additional buckets would only be necessary if you had to hold different materials or stages simultaneously, which isn’t required in this scenario. So one bucket is enough.