Homework Help Forum: math

Posted by Ta on Wednesday, November 4, 2009 at 8:34pm.

what number would it be? question: If I have 500 pearls in my bag, and I ask you to take a number of pearls that when subtracted by 1 will be divisable by the numbers from 2 to 7 excluding 4, then how many pearls will be left in the bag?

• math - Reiny, Wednesday, November 4, 2009 at 8:39pm

  I get 289. x-1 must have factors of 2,3,5, and 7 (I excluded 6, since any number divisible by 2 and 3 is also divisible by 6) so x-1 = 2*3*5*7 = 210 x = 211 so 211 was taken out of the bag of 500 pearls leaving 289

  
  

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