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

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Manager
Joined: 27 Jul 2003
Posts: 124
Location: Singapore
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Kudos [?]: 10 [0], given: 0

X^3*Y^4=5000, ask the value of Y? (1) y is positive; (2) x [#permalink]  05 Oct 2003, 23:26
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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;
Intern
Joined: 12 Sep 2003
Posts: 31
Location: Peru
Followers: 0

Kudos [?]: 0 [0], given: 0

Re: DS#7 [#permalink]  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
Intern
Joined: 13 Sep 2003
Posts: 43
Location: US
Followers: 0

Kudos [?]: 8 [0], given: 0

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.
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