Problema Solution
A bookstore had
45 copies of a magazine. Yesterday, it sold 2/3
of them. Today, it sold 4/5
of what remained. How many copies does the bookstore have left?
Answer provided by our tutors
If 2/3 of 45 were sold then what is left is 1 - 2/3 = 1/3 of 45 or (1/3)*45 = 15 copies.
Then 4/5 of 15 were sold and what is left is 1 - 4/5 = 1/5 of 15 or 3 copies.