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.)
+118667 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.
