we are given
number of pretzels =y=7
number of people=x=20
now, we have to find
constant of proportionality relates the number of pretzels to people
Let's assume they are directly related
so, we can use formula
![k=(y)/(x)](https://img.qammunity.org/2019/formulas/mathematics/college/yvbsu5pnyw56xx15nl1m8l8r1w2b23np4q.png)
where
k is constant of proportionality
y is number of pretzels
x is number of people
so, we can plug values
and we get
![k=(7)/(20)](https://img.qammunity.org/2019/formulas/mathematics/college/ip9egae061n4dz571t8pp3lqvzhv0ilndx.png)
so, constant of proportionality is
...........Answer