Red, white, and black tiles are in the ratio 2:5:3. The white fraction of the whole simplifies to 1/d. Enter d.
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2
Explication
The ratio contains 10 equal parts in total, with 5 white parts, so 5/10 simplifies to 1/2 and d is 2. Using 5 as the denominator would ignore the other coloured parts in the whole.