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A company has 10 members with an average age of 30. A new member aged 40 joins. What is the new average age?
  1. 30.5
  2. 31
  3. 33
  4. 32
Explanation

  1. Total age of 10 members = Average × Number of members

  1. Add the new member's age:

  1. Total number of members now = 10 + 1 = 11


  2. New average age = Total age ÷ Total members

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There are 54 coins in total. Some are 20-cent coins and some are 50-cent coins. Their total value is $20.70. How many 20-cent coins are there
  1. 21
  2. 23
  3. 27
  4. 31
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In a class of 20 students, the average height is 150 cm. One student with a height of 155 cm joins the class. What is the new average height?
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  2. 150.24 cm
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