We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
129
5
avatar+404 

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+18274 
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+5172 
+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+18274 
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+701 
+1

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

PartialMathematician  Jan 25, 2019

9 Online Users

avatar
avatar
avatar
avatar