The average age of a group of friends is 18 years. Two people aged 21 and 25 years join the group, making the average age go up by an even number. How many members were originally there in the group?
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The average age of a group of friends is 18 years. Two people aged 21 and 25 years join the group, making the average age go up by an even number. How many members were originally there in the group?The average age of a group of friends is 18 years. Two people aged 21 and 25 years join the group, making the average age go up by an even number. How many members were originally there in the group?The average age of a group of friends is 18 years. Two people aged 21 and 25 years join the group, making the average age go up by an even number. How many members were originally there in the group?The average age of a group of friends is 18 years. Two people aged 21 and 25 years join the group, making the average age go up by an even number. How many members were originally there in the group?The average age of a group of friends is 18