1370.21 – Dust Mites

Tags:Problem Set 12GeometryAlgebra Prep

Fifty percent more than the number of dust mites living under the king’s bed is 25 percent less than 60 percent more than 10. How many dust mites live under that bed?


Sixty percent more than 1010 is 1616. Twenty-five percent (a quarter) less than that is 1212. Let xx be the mystery number. Then fifty percent more than xx is 1.5x1.5x.

1.5x=121.5x = 12

x=121.5=8.x = \frac{12}{1.5} = 8.

That’s the answer. You can Google for images of dust mites, but brace yourself!