Two-fifths of photographs are black and white. The rest of the photographs are color. What is the ratio of black and white to color photographs?

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Answer 1 · 2018-06-05T05:47:21

2:3

$2/5$ of the photographs are black and white.

That means:

$1- 2/5 = (5-2)/5 = 3/5$ of photographs are colored.

The ratio of black and white to colored photographs will be:

$2/5 : 3/5$

$=> 2 : 3$

Answer 2 · 2018-06-05T06:21:33

$2 : 3$

The total number of photographs can be regarded as $5/5$ .

Note that $2/5 +3/5 = 5/5$

So, for every $2$ black and white photos there are $3$ colour photos.

Therefore the ratio is $2:3$