walsh help please

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senthi
Posts: 75
Joined: Wed Feb 23, 2011 12:06 am

walsh help please

Post by senthi »

walsh paper 8 Q:69

11(13)5 9(7)6 13( )7

the answer :13

can anyone explain the work out please?thank you
stevew61
Posts: 1786
Joined: Fri Nov 17, 2006 9:54 pm
Location: caversham

Re: walsh help please

Post by stevew61 »

9-6=3, 3*2=6, 6+1=7

11-5=6, 6*2=12, 12+1=13

13-7=6, 6*2=12, 12+1=13

But I did spend too long on it!
senthi
Posts: 75
Joined: Wed Feb 23, 2011 12:06 am

Re: walsh help please

Post by senthi »

thakyou very much
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