Help me with this question: On school camp a group of children went horse riding. Each child had a horse. Half decided to ride their horse while the other half decided to walk beside it. If there were 70 legs on the ground, how many children were there?

On school camp a group of children went horse riding. Each child had a horse. Half decided to ride their horse while the other half decided to walk beside it. If there were 70 legs on the ground, how many children were there?
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