Posted by **tamika** on Monday, July 25, 2011 at 12:16am.

Upon examining the contents of 38 backpacks, it was found that 23 contained a black pen, 27 contained a blue pen, and 21 contained a pencil, 15 contained both a black pen and a blue pen, 12 contained both a black pen and a pencil, 18 contained both a blue pen and a pencil, and 10 contained all three items. How many backpacks contained none of the three writing instruments?

## Answer This Question

## Related Questions

- Math - Upon examining the contents of 38 backpacks, it was found that 23 ...
- math - luke put 2 red pens, 7 blue pens, and 1 black pen in a bag, closed it and...
- Math 8th grade - A pen contained chickens and pigs. There were 28 legs and 9 ...
- Algebra - A cup of pens contains 5 red, 12 black, and 13 blue pens. A pen is ...
- Mathematics - A farmer has both ducks and pigs in a pen together. There are a ...
- Math - David wants to build a pen for his goat. He wants the area of the pen to ...
- math - david wants to build a pen for his goat. he wants the area of the pen to ...
- math - Suppose you want to build an outdoor rectangular pen enclosed by fencing ...
- Math - A Square shaped animal pen and a pen shaped like an equilateral triangle ...
- Algebra - A box contains blue and purple pens. There are 6 less than triple the ...

More Related Questions