$$\frac{ 9.4+y+6+2+4.5 }{ 15 }$$
$\frac{y}{15}+1.46$
$$\frac{15.4+y+2+4.5}{15}$$
$$\frac{17.4+y+4.5}{15}$$
$$\frac{21.9+y}{15}$$
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