5^21 * 4^11 = 2*10^n

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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Wed Apr 08, 2009 5:31 am

If 5^21 * 4^11 = 2*10^n, what is the value of n?
A. 11
B. 21
C. 22
D. 23
E. 32

OA B

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Source: Beat The GMAT — Problem Solving | Wed Apr 08, 2009 5:31 am

sacx: Master | Next Rank: 500 Posts; Posts: 139; Joined: Wed Oct 22, 2008 4:36 am; Thanked: 17 times

by sacx » Wed Apr 08, 2009 5:33 am

5^21 * 2^22 = 2*10^n
2*10^21 = 2*10^n

10^21 = 10^n

n = 21

SACX

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