Puzzlemaker
Clip Art Gallery
Lesson Plan Library
Kathy Schrock's
Guide for Educators
Brain Boosters
Learning Adventures
Science Fair Central
Curriculum Center
On TV
Young Scientist Challenge
Enter Username
Access resources you have created under your login.

Teacher Tools such as:
Lesson Plan Creator, Quiz Builder, and Worksheet Generator are no longer available.

You can create new lesson plans and quizzes within your DE streaming account. If you don't have an account, sign up for a demo here.
Favorites
Browse the Brain Boosters Gallery

 
  Number & Math Play

Condiments		  
Q There are 2 boxes, each box holding 4 mustard packets and 4 ketchup packets. Without looking, you draw 1 packet from each box. What are the chances that at least 1 of the packets you draw is mustard?


 
A There are 4 possibilities of what you might draw out of the 2 boxes:
  • 1 mustard and 1 ketchup
  • 2 mustards
  • 1 ketchup and 1 mustard
  • 2 ketchups
In 3 of the 4 possibilities, you'll wind up with at least 1 mustard. So the chances of picking at least 1 mustard packet are 3 in 4 or, in another phrasing, 3 to 1.

Source: Carter, Fulton & Russell, Mighty Mind Boosters, p.170