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Very nicely done ! You could also write out 120, 380 , 640 and 900 as well as the first few multiples of 90 and 165 to make quicker work of this question
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Mehrak’s bakery sells three types of pastries: cinnamon rolls cost $3.50 each, muffins cost $2.60 each, and apple turnovers cost $4.25 each.

What is the greatest number of pastries that can be bought there for exactly $100?

Let the number of cinnamon rolls, muffins & apple turnovers be x, y & z respectively

3.5x + 2.6y + 4.25z = 100
Maximize x+y+z

To maximize x+y+z, we need to purchase maximum lowest cost pastries with the condition that x, y & z are positive integers.

y = 25; x = 10; z = 0
x+y+z = 35

IMO B
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