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Twelve hungry teenagers can devour a very large pizza in 20 minutes. How many teenagers would it take to finish a very large pizza in 18 minutes? (Assume that all teenagers eat pizza at the same rate.)

 
 Jun 11, 2021
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12 teenagers will eat it in 20 minutes

so 1 teenager must take 12 times that 

1 teenager will take 240 minutes (so long has s/he keeps up the pace)

240/18 = 13.3

 

so    13.3 teenagers will take 18 minutes to eat the pizza.

Since it is illegal to cut teenagers up, I suppose you better have 14 teenagers 

 

Less time, more kids, seems to pass this reasonableness test.

 
 Jun 11, 2021

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