Question 355115
Hi,
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Preparing a meal for 45 persons in 6 hrs
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One assistant takes 20 hours to prepare meal for 25 People
Let x be the amount of meals in 6 hrs
{{{(25/20hr) = (5/4) = (x/6hr)}}}
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cross multiply to solve 
4x = 5*6
x = 7.5  ( An Assistant can prepare 7.5 meals in 6 hrs)
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Note: Chef can prepare 30 meals in 6 hrs. {{{(25/5) = (30/6)}}}
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There will need to be 2 Assistants hired to prepare the remaining 15 meals