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April 17th, 2018, 12:35 AM  #1 
Newbie Joined: Apr 2018 From: new delhi Posts: 1 Thanks: 0 Math Focus: Calculsis  Help
At a certain rate of compound interest, money will double in x years, money will triple in y years, and money will increase tenfold in z years. At this same rate of compound interest, \$5 will increase to \$12 in n years. Find integers a, b, and c so that n = ax + by + cz.
Last edited by skipjack; April 17th, 2018 at 01:21 AM. 
April 17th, 2018, 01:32 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,307 Thanks: 1976 
As $12/5 = 2^3\times3\times10^{1}$, (a, b, c) = (3, 1, 1).
