Practicing Success
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The average age of a group is increased by 4 years when a person of whose age is 32 years was replaced by a person whose age is 56. Find the number of people in the group. |
6 7 8 9 |
6 |
Lets assume number of people in the group be x and the average be y x(y + 4) = xy - 32 + 56 ⇒ xy + 4x = xy + 24 ⇒ 4x = 24 ⇒ x = 6 |
