ratio and proportin

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drnt: Newbie | Next Rank: 10 Posts; Posts: 4; Joined: Fri Apr 24, 2009 8:27 am

by drnt » Fri Aug 14, 2009 2:34 am

a garrison has food for22400 mean for 3 weeks.how many men should go for food to last 7 days
please explain

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Source: Beat The GMAT — Problem Solving | Fri Aug 14, 2009 2:34 am

scoobydooby: Legendary Member; Posts: 1035; Joined: Wed Aug 27, 2008 10:56 pmFollowed by: 1 member; Thanked: 104 times

by scoobydooby » Fri Aug 14, 2009 10:33 pm

this is an indirect variation

more men go=> food lasts for less weeks.
less men go=> food lasts for more weeks.

if the food is to last for 1/3 the time, 3 times as many men can go
=>2240*3=67200 men can go

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