The average is the total shared equally: total ÷ how many. When someone joins or leaves, or two groups are put together, work with the totals — never just average the averages.
Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
🏁 Lesson 16 test
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
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Part 2 · Everyday maths. You can still take the test without signing in.
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