Answer:22 weeks.
Step-by-step explanation: difference between 12 and 18 is 6, so add another 6 weeks onto 16 weeks.
Answer:
24 weeks
Step-by-step explanation:
16 divided by 12= 1.333333333
That means 1.333333333 is used in one week.
Now do 1.333333333 x 18 and you get 24.
That means a bottle of 18 ounce shampoo from the same brand will last 24 weeks.
