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Ema is travelling and covered on the first day, more than the first day on the second day, more than the second day on the third day and more than the first day on the fourth day. How far has Emma travelled in these four days?
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Ema in days travelled .
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on the first day, 
more than the first day on the second day, 
more than the second day on the third day and 
more than the first day on the fourth day. How far has Emma travelled in these four days?
days travelled 
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