$1rac12 + 3rac12 + 5rac12 + rac12=?$

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$1\frac12 + 3\frac12 + 5\frac12 + \frac12=?$

A11

B $10\frac12$

C $11\frac12$

D10

Answer:

$1\frac12+3\frac12+5\frac12+\frac12$

$=3/2+7/2+11/2+1/2$

$=(3+7+11+1)/2$

$=22/2$

$=11$

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