JEE Main 2017 · 8 Apr · Shift 1 · Mathematics Q85

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MathematicsSingle correct+4 / -1Question 85 of 90

The mean age of 25 teachers in a school is 40 years. A teacher retires at the age of 60 years and a new teacher is appointed in his place. If now the mean age of the teachers in this school is 39 years, then the age (in years) of the newly appointed teacher is :

Answer and worked solution

Official answer: C

$25\times40-60+x=25\times39$ , so $x=35$ .

Topics:Measures of central tendency

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JEE Main 2017 · 8 Apr · Shift 1, Mathematics question 85