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X^3*Y^4=5000, ask the value of Y? (1) y is positive; (2) x

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Joined: 27 Jul 2003
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X^3*Y^4=5000, ask the value of Y? (1) y is positive; (2) x [#permalink] New post 05 Oct 2003, 23:26
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A
B
C
D
E

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1. X^3*Y^4=5000, ask the value of Y?
(1) y is positive;
(2) x is integer;

2. A two digits integer X, ask the tenth digit of 2x?
(1) the ten digit of X is 3;
(2) the unit digit of 2x is 6;
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Re: DS#7 [#permalink] New post 06 Oct 2003, 20:46
[quote="araspai"]1. X^3*Y^4=5000, ask the value of Y?
(1) y is positive;
(2) x is integer;

2. A two digits integer X, ask the tenth digit of 2x?
(1) the ten digit of X is 3;
(2) the unit digit of 2x is 6;[/quote]

1- E. Y may not be an integer

2-
(1) What if the unit digit of X is >=5? Not Sufficient
(2) We do not know the tenth digit Not Sufficient.

C The tenth digit of X is 3 and the unit digit of X is 3. Sufficient
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 [#permalink] New post 31 Oct 2003, 07:53
Why can't the unit digit be 8? so 2 times 8 will b 16 and the unit digit will still be 6.There fore the answer to the second one is E.
  [#permalink] 31 Oct 2003, 07:53
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X^3*Y^4=5000, ask the value of Y? (1) y is positive; (2) x

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