Question

Jeff's hobby is to collect valuable stamps. All of his U.S. stamps are valuable. One-half of his British stamps are valuable. There are 3 times as many valuable stamps as there are U.S. stamps in his collection. Jeff has 50 British stamps and 40 U.S. stamps. How many valuable stamps does Jeff have that are neither U.S. stamps nor British stamps?

Answer 1

Answer:

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