A bookstore had 90 copies of a magazine. Yesterday,it sold 2/5 of them. Today, it sold 1/6 of what remained. How many copies does the bookstore have left?
90 * 3/5 = 54 left then 54 * 5/6 = 45
To find out how many copies the bookstore has left, we need to perform some calculations.
First, let's determine the number of copies sold yesterday. The bookstore had 90 copies and sold 2/5 of them. To find the number of copies sold, we multiply 90 by 2/5:
90 * 2/5 = 36 copies sold yesterday
Now, let's calculate how many copies remained after the sales yesterday. We subtract the number of copies sold from the initial quantity:
90 - 36 = 54 copies remaining after yesterday's sales
Next, we need to find out how many copies were sold today. The remaining copies from yesterday's sales are 54, and today's sales were 1/6 of that amount. To calculate the number of copies sold today, we multiply 54 by 1/6:
54 * 1/6 = 9 copies sold today
Finally, let's determine how many copies are left after today's sales. We subtract the copies sold today from the remaining copies after yesterday's sales:
54 - 9 = 45 copies left after today's sales
Therefore, the bookstore has 45 copies left.