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A bag placed in $\"\"$ red tiles, $\"\"$ blue tiles, $\"\"$ green tiles, $\"\"$ yellow tiles and $\"\"$ black tiles.

Find the probability of red tiles.

The total number of tiles are $\"\"$ .

The probability of selecting one tile from the total number of tiles are $\"\"$ .

$\"\"$ .

The probability of selecting one red tiles are $\"\"$ .

$\"\"$ .

The probabity is $\"\"$ .

$\"\"$ (Substitute $\"\"$ and $\"\"$ )

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The probability of red tiles is $\"\"$ . $\"\"$

The probability of red tiles is $\"\"$ .