Mike is Correct
For the bakery to make 30 batches of Raisin Nut energy bars, they need 84 cups of granola. While making 15 batches of Honey Almond energy bars requires 63 cups of granola.
Hence why he is correct.
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Working:
I got 84 by doing 28 x 3.
And I got 63 by doing 42 divided by 2 (which is 21) then multiplying it by 3 (which gets me to 63).