Question

Each chef at "sushi emperor" prepares 151515 regular rolls and 202020 vegetarian rolls daily. on tuesday, each customer ate 222 regular rolls and 333 vegetarian rolls. by the end of the day, 444 regular rolls and 111 vegetarian roll remained uneaten. how many chefs and how many customers were in "sushi emperor" on tuesday?

Answer 1

Solving the Diophantine equations for chefs (c) and customers (q) ...
.. 15c -2q = 4
.. 20c -3q = 1
we find that c=2 and q=13 are common solutions.

There were 2 chefs and 13 customers on Tuesday.


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It looks like this is better solved using proportions, since the ratio of roll production is different than the ratio of roll consumption. There can only be one solution.
.. (15c-4)/(20c-1) = 2/3 . . . . the ratio of rolls produced is the same as the ratio of rolls consumed
.. 3(15c -4) = 2(20c -1)
.. 45c -12 = 40c -2
.. 5c =10
.. c = 2 . . . . there were 2 chefs
They produced 30 rolls, of which 4 were left and the remaining devoured 2 at a time. Hence there were
.. (30 -4)/2 = 13 customers.