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## Exponent algebra

This topic has 1 member reply
ash_maverick Senior | Next Rank: 100 Posts
Joined
07 Jan 2007
Posted:
31 messages

#### Exponent algebra

Wed Feb 28, 2007 8:23 pm
x and y are positive integers.if [5^x]-[5^y]=[2^(y-1)][5^x] , what is the value of xy?

(A) 48
(B) 36
(C) 24
(D) 18
(E) 12--ans

corrected...sorry for the misstake.

Last edited by ash_maverick on Thu Mar 01, 2007 11:32 am; edited 2 times in total

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jayhawk2001 Community Manager
Joined
28 Jan 2007
Posted:
789 messages
Followed by:
1 members
30
Wed Feb 28, 2007 10:24 pm

I'm guessing the word missing here is "consecutive" positive integers,
in which case only 3*4 = 12 would make the cut. Else, it would be impossible to find out xy from just "positive integers" especially since
all the answers are products of 2 positive integers.

[quote="ash_maverick"]x and y are positive integers. , what is the value of xy?

(A) 48
(B) 36
(C) 24
(D) 18
(E) 12--ans

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