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Explore the Back-StoryTry this beautiful Problem based on Simple Arithmetic from Math Kangraoo Benjamin 2014 Problem 11.

In a holiday camp 7 children eat ice cream every day, 9 eat ice cream every other day. The remaining children don't eat ice cream at all. Yesterday 13 children ate ice cream. How many children will eat ice cream today?

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Substraction

Arithmetic

Mathematics Can Be Fun by Perelman

Math Kangraoo Benjamin 2014 Problem number 11

10

Find the number of the ones who eat on alternative days.

Now find for today how many participants are there.

So this value should be $9-6=3$.

So, find the number of students eating today .

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