Answer
$$ \frac{3}{4}$$
Work Step by Step
The number of websites in Italy and China combined, in millions, is:
$$ = 25+20 \\ =45$$
Thus, the ratio is:
$$ =\frac{45}{60} \\ =\frac{3\times 15}{4\times 15} \\ = \frac{3}{4}$$
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