Number properties / Data sufficiency strategy

[tgilham]

Hi, I have a query around the second re-phrased data sufficiency question on page 98. If the second statement tells us that x= 2z+2 where z is an integer, then presumably z could be 0, in which case x would equal 2. If x=2 then the solution to the main equation in the question would be zero, which is not divisible by 4. Doesn't this make statement 2 insufficient or have I missed something?

Thanks

[tim]

what makes you say 0 is not divisible by 4? divide it by 4 - do you get an integer?

[tgilham]

Thanks! I was getting this confused with the rule that states division by 0 as undefined! I realise this doesn't make any sense in reverse!

[tim]

right. you can divide 0 by anything and still get 0. that means 0 is divisible by literally every number..