Question

there were 50 cars parked at the airport car rental lot. Of those 50 cars, 10% were red. How many cars were red?

Answer 1

10% of the 50  were red.

10% * 50

(10/100) * 50

(1/10) * 50

= 5

5 were red.

Answer 2

5 cars were red 
remember that 50 means half