SOLUTION: A box contains 320 ping pong balls. Some are orange and some have been marked with a marker. 242 ping pong balls are orange, 165 of which have been marked with a marker. How many

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Question 1201693: A box contains 320 ping pong balls. Some are orange and some have been marked with a marker. 242 ping pong balls are orange, 165 of which have been marked with a marker. How many ping pong balls are not orange? Show with a Venn diagram.
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
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A box contains 320 ping pong balls. Some are orange and some have been marked with a marker.
242 ping pong balls are orange, 165 of which have been marked with a marker. How many ping pong balls are not orange?
Show with a Venn diagram.
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320 - 242 balls are not orange.

Hope you are able to compute the number from this expression.

Venn diagram is not needed to solve this problem.   Common sense is just enough.

What is really need are these necessary skills

        - 1)   ability to read;
        - 2)   ability to understand written text,  and
        - 3)   ability to make simplest logical implications from the written text.

And it is what the tutors or teachers should teach their pupils: to the ability to think for themselves.