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How many boys were missing from the lesson? Math puzzle

A math puzzle for teens

                                       Practice in number theory                                                                                                      

                  
                                                                                               Try to solve this math puzzle
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Below you can see the solution.




If x is the number of children who came to the class then 14 are girls and the boys are 30/100 x.
x = 14 + 0.3x
0.7 x = 14
χ = 20
So the boys are 20-14 = 6

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