Page 1 of 1

One of those X(Y)Z type ones

Posted: Thu Apr 19, 2012 6:22 pm
by Long Journey
Not sure what they're called, but can someone help with this please? I'm probably missing something simple here, but we've been mulling over this one and can't figure it out.

6 (15) 11 | 9 (16) 15 | 4 ( ) 11

From SD T&P3.

Re: One of those X(Y)Z type ones

Posted: Thu Apr 19, 2012 6:51 pm
by dlb
I couldn't work it out but my 10 year old son did!

11-6 = 5 add 10 = 15
15-9 =6 add 10 =16
11-4 =7 add 10 = 17

Re: One of those X(Y)Z type ones

Posted: Thu Apr 19, 2012 9:00 pm
by Long Journey
Oh right :oops: .

Many thanks to your son dlb.