Mr. Kwon has just enough money to buy only 20 mangoes or only 30 oranges. If he wants to buy equal numbers of mangoes and oranges together, how many of each type can he buy with the money?

To find out how many of each type (mangoes and oranges) Mr. Kwon can buy, let's first find the common number that both quantities (20 and 30) divide evenly into. This will give us the maximum number of equal sets he can buy.

The common number that both 20 and 30 divide evenly into is 60. This tells us that Mr. Kwon can buy 60 items in total.

Since he wants to buy an equal number of mangoes and oranges, we divide 60 by 2 to get 30. This means he can buy 30 of each type (mangoes and oranges) with the money he has.