Step-by-step explanation:
x= children
y= adult
First equation: x+y= 75
Second equation: 3.25x + 3.75y= 265.75
Third equation from First equation:
x= 75-y
Second: 3.25(75-y) + 3.75y= 265.75
243.75-3.25y + 3.75y= 265.75
0.5y= 22
y= 44
44 adults
Third: x=75-44
= 31
31 children
So total there are 44 adults and 31 children.
Hope this help you!