Question 28: Mai uses 2500 VND to buy a pen. There are two types of pens: Type I costs 2,000 VND each, Type II costs 1500 VND each. How many pens can Mai buy at most if Mai buys both pens in the same quantity?
The amount to buy 1 type I and 1 type II pen is:
We have 25000 : 3500 = 7 (remainder 500)
So Mai can buy at most 7 type I and 7 type II pens.