BRAIN BUILDERS CHALLENGES

Here are riddles to challenge your brain. To solve them, pay attention to details and read carefully, just as you would if you were taking a test. Zero in on the question and go back to the text looking only for information about the question.

You are the chief scientist in a lab that has been open for seven years. In the lab are bacteria and other species for research, test tubes, microscopes, and other lab machinery. Five other people work at the lab, but right now two of them are traveling in Brazil to collect specimens. Four students are visiting the lab to learn about science.

They want to know:
How old is the chief scientist?

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