This money puzzle starts with $900 and gives two instructions: remove half, then add $90.
The correct answer is $540.
Half of $900 is $450. If you remove $450 from $900, you are left with $450.
Then add $90: $450 + $90 = $540.
So the full calculation is $900 − $450 + $90 = $540.
The wording can make this look like a trick, but the simplest interpretation works perfectly. Calculate half of the original amount, subtract it, then add the final amount given in the puzzle.
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