Final answer:
To solve this challenge, you need to find two groups of cards with the same sum using as many cards as possible.
Step-by-step explanation:
In this challenge, you are given eight cards - five green and three yellow.
The goal is to create two groups of cards with the same sum using as many cards as possible.
To solve this, you can start by arranging the cards in different groups and finding the sum of each group.
You can then rearrange the cards until you achieve two groups with the same sum.
This challenge involves basic addition and problem-solving skills.