The average of a non-zero number and its square is $5$ times the number. The number is
The average of a non-zero number and its square is $5$ times the number. The number is
- A
$9$
- B
$17$
- C
$29$
- D
$295$
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Average rainfall on Monday, Tuesday, Wednesday and Thursday is $420.5\, cm$ and average on Tuesday, Wednesday, Thursday and Friday is $440.5\, cm .$ If the ratio of rainfall for Monday and Friday is $20: 21,$ find the rainfall in $cm$ on Monday and Friday.
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