The mean age of $33$ students of a class is $13$ years. If one girl leaves the class, the mean becomes $12 \frac{15}{16}$ years. What is the age of the girl?

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Solution

$\begin{matrix} x - t o t a l n u m b e r o f s t u d e n t e x c e p t h a t g i r l y - a g e o f g i r l \frac{x + y}{33} = 13 \frac{x}{32} = \frac{207}{16} x = 414 y = 15 y e a r s \end{matrix}$

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The mean age of 33 students of a class is 13 years. If one girl leaves the class, the mean becomes 121516 years. What is the age of the girl?

x−totalnumberofstudentexcepthatgirly−ageofgirlx+y33=13x32=20716x=414y=15years

The mean age of $33$ students of a class is $13$ years. If one girl leaves the class, the mean becomes $12 \frac{15}{16}$ years. What is the age of the girl?

$\begin{matrix} x - t o t a l n u m b e r o f s t u d e n t e x c e p t h a t g i r l y - a g e o f g i r l \frac{x + y}{33} = 13 \frac{x}{32} = \frac{207}{16} x = 414 y = 15 y e a r s \end{matrix}$