If six out of 15 customers order a chicken sandwich, how many chicken sandwiches should a restaurant predict they will need to serve 270 people?

108

270

90

120

Given:

6 out of 15 customers order a chicken sandwich

270 customers

This is a problem of ratio and proportion:

a/b = c/d where ad = bc

6/15 = x/270

6 * 270 = 15x

1,620 = 15x

1620 / 15 = x

108 = x

The restaurant should predict to serve 108 chicken sandwich to the 270 people.