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If s is a two-digit number (so s = qp with q and p

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VP
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If s is a two-digit number (so s = qp with q and p [#permalink] New post 17 Feb 2005, 23:20
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5) If s is a two-digit number (so s = qp with q and p digits), what is the last digit p of s?

(1) The number 3s is a three-digit number whose last digit is p
(2) The digit p is less than 7
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 [#permalink] New post 18 Feb 2005, 07:45
could someone please explain in detail please.

Thanks
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 [#permalink] New post 18 Feb 2005, 07:49
Given the constraints of the problem
if qp=s then statement 1 gives you 3s=3qp
statement 2 tells you p<7
neither statements alone not together can help you ditermine the exact value of p.
Sufficiency only requires you to figure out if you can get the answer or not, and if so which one of the statement is needed or if both are needed
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 [#permalink] New post 18 Feb 2005, 08:38
"E".


State 1: p can be 0 or 5 only....insuff

State 2: Doesn't say anything...insuff


Together again p can be 0 or 5....insuff
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 [#permalink] New post 18 Feb 2005, 19:28
E it is....

1) qp*3=100x+10y+p; p can be 0 or 5

2) p<7...can be 1, 2, 3 etc

together 5 and 0 are less than 7
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 [#permalink] New post 18 Feb 2005, 19:51
let s=34.
then 3s = 102,p=2

let s=40
then 3s = 120,p=0

E
  [#permalink] 18 Feb 2005, 19:51
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