Help with number sequence in new Letts Test A, 78 please

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mandelbaum
Posts: 46
Joined: Wed Jul 07, 2010 1:36 pm

Help with number sequence in new Letts Test A, 78 please

Post by mandelbaum »

The answer to the following sequence is supposed to be 42:

66, 6, 70, 12, 78, 24, 90,

Would anybody be able to explain why? We thought it ought to be 48. Thanks for any help.
stevew61
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Joined: Fri Nov 17, 2006 9:54 pm
Location: caversham

Re: Help with number sequence in new Letts Test A, 78 please

Post by stevew61 »

Alternate sequnces.

66 70 78 90 (+4 +8 +12)

6 12 24 (+6 +12 so +18) 42

Although I would have looked for 48 first!
mandelbaum
Posts: 46
Joined: Wed Jul 07, 2010 1:36 pm

Re: Help with number sequence in new Letts Test A, 78 please

Post by mandelbaum »

That's great! Thank you so much. Just couldn't get my head around it! :D
yoyo123
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Location: East Kent

Re: Help with number sequence in new Letts Test A, 78 please

Post by yoyo123 »

ambiguous as the sequence could be 6, 12, 24, 48..

was this multiple choice ? if so i presume 48 was not an option.

if it was standard it is a bit misleading
mandelbaum
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Joined: Wed Jul 07, 2010 1:36 pm

Re: Help with number sequence in new Letts Test A, 78 please

Post by mandelbaum »

Thanks; it was the standard version.
yoyo123
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Location: East Kent

Re: Help with number sequence in new Letts Test A, 78 please

Post by yoyo123 »

definitely misleading then
stevew61
Posts: 1786
Joined: Fri Nov 17, 2006 9:54 pm
Location: caversham

Re: Help with number sequence in new Letts Test A, 78 please

Post by stevew61 »

It may be that in the event of doubt and no multiple choice you have to use the completed pattern as your template. So adding not doubling.

Hmm this standard VR is going to be fun. :)
Grace
Posts: 3
Joined: Mon Feb 11, 2008 5:19 pm
Location: Bucks

Re: Help with number sequence in new Letts Test A, 78 please

Post by Grace »

What about Bright Sparks test 2 question 66 ?

42 50 44 48 48 44 54 38 (?)

The answer is given as 62 but my mind is blank!

I would be grateful for any help.
TP123
Posts: 466
Joined: Fri Nov 20, 2009 11:46 am

Re: Help with number sequence in new Letts Test A, 78 please

Post by TP123 »

42, 44, 48, 54
+2 +4 +6 +8

so 54+8=62
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