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Kate's Date

Stage: 3 Short Challenge Level: Challenge Level:1

The average (mean) weight of five giant dates was 50g. Kate ate one and the average (mean) weight of the four remaining dates was 40g.

What was the weight of the date that Kate ate?

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.  

This problem is taken from the UKMT Mathematical Challenges.
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