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Find a number between 364 and 384 that is both a multiple of 7 and 3

Guest May 4, 2015

Best Answer 

 #1
avatar+90053 
+5

If this number is a multiple of 7 and 3, it must be divisible by 21

So 

384 mod 21   =  6

So...this number must be 

304 - 6 = 378

And 378 factors as.. 2 x 3 x 3 x 3 x 7 =  2 x 3 x 3 x 21

 

  

CPhill  May 4, 2015
 #1
avatar+90053 
+5
Best Answer

If this number is a multiple of 7 and 3, it must be divisible by 21

So 

384 mod 21   =  6

So...this number must be 

304 - 6 = 378

And 378 factors as.. 2 x 3 x 3 x 3 x 7 =  2 x 3 x 3 x 21

 

  

CPhill  May 4, 2015

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