Answer:
164 kids
165 adults
Explanation:
First you need to make two equations
kids = x
adults = y
first equation = x+y=329
second equation = 1.5x + 4y = 906
solve by substitution
x = 329 - y
1.5 (329 - y) + 4 y = 906
493.5 - 1.5y + 4y = 906
combine like terms
2.5y = 412.5
y = 165
plug back into one of the equations
x + 165 = 329
x = 164