+0  
 
0
353
5
avatar+410 

This Question Has 2 Parts That Don't Even Match. I Don't Know Why.

 

Part A:

 

If two consecutive whole numbers have a different number of digits, then their product must be a multiple of...
 

Answer Choices

4

11

15

100

 

Part B:

 

Last month I spent $24 on magnets that cost 80 cents each, and this monthI spent $24 on magnets that cost $1.20 each. The average cost per magnet was...

 

Answer Choices

92 cents

96 cents

$1

$1.04

 

 

 

 

 

 

 

Thanks for your time and help!

 Jan 24, 2019
 #1
avatar+26007 
0

9 x 10 = 90    divisible by  15

99 x 100 = 9900    divisible by 4 and 15

999 x 1000 = 999 000  divisible by 4 and 15      see a pattern here?

 

 

B:  2400 cents /80 cents/magnet  = 30 magnets     2400/120 = 20 magnets      

          4800 total / (30 + 20 magnets) = 96 cents/magnet

 Jan 24, 2019
edited by ElectricPavlov  Jan 25, 2019
 #2
avatar+6196 
+1

90 is divisible by 4? 

Rom  Jan 25, 2019
 #3
avatar
+1

There might be some magnetic interference. You know, from all the magnets in the other question ... LOL   

Guest Jan 25, 2019
 #4
avatar+26007 
0

Well yah......22.5           it's just not a 'factor'          ooops....fixed..

.Miscopied from my scratch pad....   cheeky

ElectricPavlov  Jan 25, 2019
edited by ElectricPavlov  Jan 25, 2019
 #5
avatar+770 
+2

No, the factor that is in all the products is 15, which is why it is highlighted.

PartialMathematician  Jan 25, 2019

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