Question

Every day the Chan family restaurant serves 9/10 of a bottle of soda to their customers. How many days will 7 1/5 bottles of soda last??

Answer 1

The stock of soda will last for 8 days

Explanation:

Change the denominator to a common one, i.e. change 1/5 to 2/10

Now make both numbers to improper fractions; you get 9/10 of a bottle per day and 72/10 bottles of soda in stock.

With a common denominator, we can now simply ignore it. Divide 72 by 9 to get 8 days.