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Find the number in the form x3579x that is divisible by 42.

 Feb 14, 2021
 #1
avatar+530 
0

First we know that x ≠ odd. This is because for it to be divisible by 42, it needs to be even. 

 

This means we can try 2, 4, 6 and 8 as x

 

235792 ÷ 42 ≈ 5614.0952

 

435794 ÷ 42 ≈ 10,376.0476

 

635796 ÷ 42 = 15,138

 

835798 ÷ 42 ≈ 19,899.9524

 

This means x = 6, which is your answer :)

 Feb 14, 2021
 #2
avatar+31826 
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Has to end in an even number

 

trial and error shows   x = 6  

 Feb 14, 2021

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