the average age of 4 children is 11 years if the ages of 3 children are 9 years 12 years and 10 years then find the age of 4th child
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it would be 11 as it is cycling through them but that is my opinion so plz no offence
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Let the age of 4th child be x.
Average = Sum of all outcomes/ No. of outcomes
= 9 + 12 + 10 + x / 4 = 11
= 31 + x / 4 = 11
= 31 + x = 11 × 4 = 44
x = 44 - 31 = 13
x = 13
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