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Question
the average age of 12 children is 20 years. If the age of one more child is added, the average decreased by 1. What is the age of child added later?
5
7
19
20
15
ANSWER : 2
Descrption
<p>Average of 12 is 20</p> <p>Total = 12 × 20 = 240</p> <p>Let the age of one more is x</p> <p>So, total 240 + x</p> <p>Average of 13 is (240 + x)/13</p> <p>ATQ</p> <p>(240 + x)/13 = 19</p> <p>or, 240 + x = 13 × 19</p> <p>or, 240 + x = 247</p> <p>∴ x = 7 (ans)</p>
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