A group of friends has an average age of 25 years. If one friend aged 30 joins, what is the new average age of the group of 4 friends?

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Q: A group of friends has an average age of 25 years. If one friend aged 30 joins, what is the new average age of the group of 4 friends?

Solution: Total age of 3 friends = 25 * 3 = 75. New total = 75 + 30 = 105. New average = 105 / 4 = 26.25.

Steps: 4

Step 1: Calculate the total age of the original 3 friends. Since their average age is 25, multiply 25 by 3 (the number of friends). This gives you 75.
Step 2: Add the age of the new friend (30 years) to the total age of the original friends. So, 75 + 30 equals 105.
Step 3: Now, count the total number of friends. There are now 4 friends (3 original + 1 new).
Step 4: To find the new average age, divide the new total age (105) by the number of friends (4). So, 105 divided by 4 equals 26.25.