find the value

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ramyaravindran: Senior | Next Rank: 100 Posts; Posts: 49; Joined: Mon Apr 28, 2008 5:33 am; Thanked: 2 times

by ramyaravindran » Mon Mar 08, 2010 5:46 am

Can somebody help with this one? I don't have a OA.
Given a series f1, f2, f3.................. with f5 = 39 & f8 = 70. If the terms from f3 is sum of the preceeding two terms, then what is the valueof f9?

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Source: Beat The GMAT — Problem Solving | Mon Mar 08, 2010 5:46 am

bpgen: Master | Next Rank: 500 Posts; Posts: 142; Joined: Sat Feb 20, 2010 7:23 pmFollowed by: 1 member; Thanked: 8 times

by bpgen » Mon Mar 08, 2010 6:06 am

we could formulate as following:

39+f6=f7
f6+f7=70

f7+70=f9

where from first two equation we can get f7=109/2, hence f9=109/2+70

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