25 mm is equal to how many cm?
25mm = 2.5cm
Using the color(blue)related conversion
That is color(red)(bar(ul(|color(white)(a/a)color(black)(1cm=10mm)color(white)(a/a)|)))
so we have 2+1/2cm=2 1/2=2.5cm
or using color(blue)ratio method
(1cm)/(10mm)=(xcm)/(25mm) require to calculate value of x