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0
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Andy had a large collection of trading cards of famous soccer players. Many of his cards featured either Neymar (15%) or Mbappe (10%). However, Andy grew increasing discontent with Neymar’s behavior (as a “diver”) and traded all of his Neymar cards for other cards. Since Neymar cards were still quite valuable despite his antics, he managed to trade one Neymar card for 3 other cards (but none of them featured Mbappe). After the trade, what fraction of his cards feature Mbappe?

Jan 10, 2021

#1
+128845
+2

For convenience sake.....let Andy's original collection   =  100 cards

So   Neymar comprised   15 of these  and  Mbappe  comprised  10

If he traded 1  Neymar card for  3 other cards, then   he got rid  of 15 cards and acquired 3  times this many =  45

So....now he has     100 - 15  + 45 =    130 cards

And  Mbappe's cards must  be     10  / 130   =   1/13  of the  collection

Jan 10, 2021
#2
+328
+2

thanks Cphill, you and many other people have answered many of my problems so thank you to you all

Jan 10, 2021
edited by Potatobird  Jan 10, 2021
#3
+128845
+1