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Verified Answer :

x=number of the chairs     y=the total cost of chairs  
150/50=3$                   y=3x

Answer:

\(50x=150\)

Step-by-step explanation:

Given : The Ferry family rented 50 chairs for $150.

To Find: Which expression can be used to find the cost per chair?

Solution:

Let the cost of 1 chair be x

Cost of 50 chairs = 50 x

Since we are given that the cost of 50 chairs is $150

So, \(50x=150\)

Hence The expression can be used to find the cost per chair is  \(50x=150\)