A student studied 18 hours in one week. What is the total number of hours he will have to study during the next week in order to average 2 hours of study per day for the entire 14-day period?

Step-by-step explanation:

[ (2 hours) / (1 day) ] (14 days) = (18+x) hours

Let's note that the unit of day is in the numerator and denominator. It cancels

[ (2 hours) / (1 day) ] (14 days) = (18 hours) + (x hours)

(2 hours) (14) = (18+x) hours

Let's note that the unit of hours is in the numerators of both sides of the equation. It cancels

(2 hours) (14) = (18+x) hours

(2) (14) = 18+x

28=18+x

10=x

HE WILL HAVE TO STUDY 10 HOURS.