Answer:
1.5m + d = 24
Step-by-step explanation:
Each muffin costs $1.50.
m number of muffins cost m * $1.50 or 1.5m.
Each doughnut costs $1.00.
d number of doughnuts cost d * $1.00 or 1d or simply d.
The total cost of muffins and doughnuts is
1.5m + d.
We are told the total cost is $24, so we get
1.5m + d = 24