Given:
• Ratio of adults to children = 12 : 3
,
• Total number of people = 90
Let's find the number of children in the park.
To find the number of children, apply the formula:
![\text{Number of children = }\frac{ratio\text{ of chil}ldren}{\text{total ratio}}*\text{total number of people}](https://img.qammunity.org/2023/formulas/mathematics/college/faqrf3k9zvlyn79rezapfhszeo21ym22i4.png)
Where:
Ratio of children = 3
Total ratio = 12 + 3 = 15
Thus, we have:
![\begin{gathered} \text{Number of children=}(3)/(15)*90 \\ \\ \text{Number of children}=0.2*90=18 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/biu8ibbq9u0r95oiuhdh7w5njkfq1j4cgd.png)
Therefore, the number of children in the park is 18 .
ANSWER:
18