+53 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?
+237 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
