Final answer:
To find out how many children joined the 4 children on the rug, set up and solve an equation to determine the number of additional children.
Explanation:
To find out how many children joined the 4 children on the rug, you can set up an equation:
4 (initial children) + x (children that joined) = 10 (total children)
Solving for x:
4 + x = 10
x = 10 - 4
x = 6
Therefore, 6 children joined the initial 4 children on the rug.
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