1. The problem states Kelly gave 1/5 of her picture cards to Holly, and that amount is 10 cards. 2. To find the total number of picture cards Kelly had, we use the fact that 1/5 of the total equals 10. 3. So, total cards = 10 \times 5 = 50 cards. 4. Kelly gave away 10 cards, so the number of cards left is total cards minus given cards. 5. Cards left = 50 - 10 = 40 cards. 6. Therefore, Kelly has 40 picture cards left.