There have been 15 "Where's Waldo?" books published. Each book has 30 puzzles to find Waldo. The average person takes 3 minutes to find Waldo in a puzzle. How long would it take to find every Waldo?
There have been 450 puzzles because 15 x 30 = 
<gadget id="calculator">450</gadget>
<output>450</output>
450.
It would take 1,350 minutes to find all the Waldo's because 450 x 3 = 
<gadget id="calculator">450*3</gadget>
<output>1_350</output>
1,350.

<result>1_350</result>