Test Your EQ (Engineering Quotient)

EQ #4

While not an engineering question per se, here’s a problem where “thinking outside the box” can help lead to a solution. It’s fairly straightforward to create the number 55 by using the digit 4 five times:

Can you create the number 55 using the digit 4 just four or fewer times? You may use any mathematical operation, but no other digits.

I’m not aware of any solution using four 4s, but here’s one using just three:


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