Final answer:
The equivalent ratio is [ 7 : 2 ] or 3.5 napkins for every 1 person.
Step-by-step explanation:
To find the equivalent ratio, we can set up a proportion using the given information.
The ratio is 35 napkins for every 10 people. We can set this up as:
35 napkins / 10 people = x napkins / y people
Cross multiplying, we get:
35y = 10x
x / y = 35 / 10
x / y = 7 : 2
Therefore, the equivalent ratio is [ 7 : 2 ] or 3.5 napkins for every 1 person.