Final answer:
To find out how many people are not adults among a total of 1400 people, when 3 out of 7 people are adults, one must calculate 1400 × (4/7), which equals 800. Therefore, 800 people are predicted to be not adults.
Step-by-step explanation:
The question asks us to predict how many people are not adults in a park where 3 out of 7 people are adults. If there are a total of 1400 people in the park, to find out how many are not adults, we must first determine the fraction representing children. Since 3 out of 7 are adults, the remaining 4 out of 7 are children.
To calculate the number of people who are not adults, we multiply the total population by the fraction representing children:
- Total population = 1400
- Fraction representing children = 4/7
- Number of people who are not adults = Total population × Fraction representing children = 1400 × (4/7)
- This gives us: 1400 × (4/7) = 800
Therefore, we can predict that 800 people in the park are not adults.