Answer:
6 adults
Step-by-step explanation:
Let
x -----> the number of children
y ----> the number of adults
we know that
The ratio
[tex]\frac{x}{y}=\frac{20}{15}[/tex]
so
using proportion
Find the value of y for x=(20-12)=8
[tex]\frac{20}{15}=\frac{8}{y}\\\\y=15*8/20\\\\y=6[/tex]
therefore
6 adults