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RE: Math Challenge #1 - 5th grade math problem
The answer depends on the implied parentheses:
(6/2)(2+1) = 9
6/(2(2+1)) = 1
If this equation was used by manned space flight engineers, it could result in the astronauts being unable to return to Earth. It's very important to include enough parentheses to eliminate calculation errors. Someone's life could depend on it.