In every batch of 4 children there were 3 girls and 1 boy.

Divide 424 by 4 and you get 106.

So, there are 106 batches of 4 in 424.

And there are 3 girls in every batch.

Which makes for 3 * 106 = 318

**So, there are 318 girls in all**

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I read this as the girls being in the majority 3:1=girls:boys.