The function f is defined for each positive three-digit inte

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BTGmoderatorAT: Moderator; Posts: 426; Joined: Tue Aug 22, 2017 8:48 pm; Followed by:1 members

The function f is defined for each positive three-digit inte

by BTGmoderatorAT » Tue Sep 12, 2017 5:14 am

The function f is defined for each positive three-digit integer n by f(n)=2x3y5zf(n)=2x3y5z , where x, y and z are the hundreds, tens, and units digits of n, respectively. If m and v are three-digit positive integers such that f(m)=9âˆ—f(v)f(m)=9âˆ—f(v) , then mâˆ’v=mâˆ’v= ?

(A) 8
(B) 9
(C) 18
(D) 20
(E) 80

What's the best approach to determine the answer?

OA: D

Quote

Source: Beat The GMAT — Problem Solving | Tue Sep 12, 2017 5:14 am

DavidG@VeritasPrep: Legendary Member; Posts: 2663; Joined: Wed Jan 14, 2015 8:25 am; Location: Boston, MA; Thanked: 1153 times; Followed by:128 members; GMAT Score:770

by DavidG@VeritasPrep » Tue Sep 12, 2017 8:07 am

ardz24 wrote:The function f is defined for each positive three-digit integer n by f(n)=2x3y5zf(n)=2x3y5z , where x, y and z are the hundreds, tens, and units digits of n, respectively. If m and v are three-digit positive integers such that f(m)=9âˆ—f(v)f(m)=9âˆ—f(v) , then mâˆ’v=mâˆ’v= ?

(A) 8
(B) 9
(C) 18
(D) 20
(E) 80

What's the best approach to determine the answer?

OA: D

Would you mind reposting this one with some clearer formatting?