Thursday, September 14, 2006
Stamp collection
My sister has six red stamps and three blue ones. In her collection, seven stamps are from Mexico and six stamps are from France. One stamp is purple and it is not from Mexico or France. Two of her Mexican stamps are red and one is blue. Two of her French stamps are blue and three are red. How many stamps does she have?
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Am going to say 15.
ReplyDeleteFrom the 10 colors mentioned, (6 red, 3 blue and 1 purple). Now, from the country stamps, eliminate three (of seven) for the red and blue stamps for Mexico, and eliminate five (of six) for French stamps.
10 colors + 4 Mex + 1 F = 15 stamps.
She has a minimum of 15 stamps.
ReplyDeleteMexico: 1 blue, 2 red, 4 unknown color
France: 2 blue, 3 red, 1 unknown color
Unknown country: 1 purple, 1 red
... and for all we know, she might also have 2 green stamps from Germany.
i'm guessing it's 31??..
ReplyDeleteIt's always great when someone comments on these older puzzles. The minimum number of stamps is 15. As Mr Don pointed out, there were at least 10 based on the colors, then you need to put in the countries.
ReplyDelete