Answer:
8 people
Step-by-step explanation:
There are two ways of doing this question, so i have put both in here. One is mathematically, and another with a diagram.
Mathematically:
For this we will add the two types of speaker (french and spanish)
20 + 30 = 50
but we see this is > 42 (greater than 42).
If we subtract 42 from 50 we get 8. This is the smallest number of crossover we can have.
Hope this helped x
With a diagram:
