VTMO 2026 - Grade 2 - Final - SET 2 - Self-study Question 19

Đào and Hằng start with the same number of candies. Each day Đào eats 3 candies and Hằng eats 2. After some days, Đào has 4 candies left and Hằng has 9. How many candies did each girl have at first?