document.write( "Question 1184253: Hi
\n" ); document.write( "In a castle there is enough food for 72 soldiers to last 24 days. After 4 days another 8 soldiers join them. How many days will the remaining food last.\r
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Algebra.Com's Answer #814802 by greenestamps(13195)\"\" \"About 
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\n" ); document.write( "Initially there is enough food for 72 soldiers for 24 days.

\n" ); document.write( "After 4 days, there is enough food for those 72 soldiers for 20 days.

\n" ); document.write( "When 8 more soldiers join them, the number of soldiers increases by a factor of 80/72 = 10/9.

\n" ); document.write( "That means the number of days the remaining food will last DECREASES by a factor of 10/9: 20*(9/10) = 18.

\n" ); document.write( "ANSWER: The remaining food will last 18 days.

\n" ); document.write( "Another solution method....

\n" ); document.write( "Initially, the number of \"soldier-days\" the food will last is 72*24=1728.

\n" ); document.write( "In 4 days, the amount of food consumed by the 72 soldiers is 72*4=288; the number of soldier-days of food remaining is 1728-288=1440.

\n" ); document.write( "The number of days 1440 soldier-days of food will last with 72+8=80 soldiers is 1440/80=18.

\n" ); document.write( "ANSWER: 18 days

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