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Peter collected 9 times as many comics as Danny. When Peter gave Danny some of his comics, they each had 20. How many comics had Peter given to Danny?

 Jan 16, 2022
 #1
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Let Danny has 'x' comics 

So, according to the question

       Peter has '9x' comics

     assume that Peter gave 'y' comics

  to Danny

Therefore,               9x - y = 20 - (1)

                                x + y = 20 - (2)

          adding equation (1) + (2)

                          10x = 40

                              x = 4

put the value of x in equation (2) we get 

                       4 + y = 20

                             y = 20 - 4

                                = 16

So, the number of comics Peter gave to Danny

is 16

 Jan 17, 2022

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