The admission fee at an amusement park is 1.5 dollars for children and 4 dollars for adults. on a certain day, 308 people entered the park, and the admission fees collected totaled 812 dollars. how many children and how many adults were admitted?

Child = $1.50
Adult = $4
Total people = 308
Total collected = $812

Assumed all children:
308 x 1.5 = $462

Extra not accounted for:
812 - 462 = $350

Difference in the admin fee:
$4 - $1.50 = $2.50

Find number of adults:
350 ÷ 2.5 = 140 adults

Find number of children:
308 - 140 = 168 children

There were 140 adults and 168 children.