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The average of $8$ readings is $24.3$, out of which the average of first two is $18.5$ and that of next three is $21.2$. If the sixth reading is $3$ less than seventh and $8$ less than eighth, what is the sixth reading ?

1. $24.8$
2. $26.5$
3. $27.6$
4. $29.4$

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