Proportion problem.
for every person who has the flu, there are 6 people who have only flu-like symptoms. if a doctor sees 40 patients, determine approximately how many patients you would expect to have only flu-like symptoms.

no, because the sides are not congruent

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: