140 Adult
124 Children
A system of equations in two unknowns, x and y should work here
x = children
y = adults
Equation 1 Total number of people admitted
x + y = 264
Equation 2 Total amount of admission fees collected
1.5x + 4y = 746
Use Equation 1 to set up a substitution
x + y = 264
y = 264 - x
Substitute this quantity for y in Equation 2
1.5x + 4(264 -x) = 746
1.5x + 1056 -4x = 746
Combine like terms
-2.5x + 1056 = 746
Subtract 1056 from both sides of the equation
-2.5x = -310
Divide both sides of the equation by negative 2.5
x = 124 children
y = 264 -x
y= 264 -124
y=140 adults
Checking in Equation 2
1.5(124) + 4(140) = 746
186 + 560 = 746
I hope you find this useful