Answer:
8/17
Explanation:
You want the ratio of 32 mm to 6.8 cm, compared in mm.
The ratio of interest is ...
(32 mm)/(6.8 cm) = (32 mm)/(68 mm) = (4·8)/(4·17) . . . . . mm cancels
= 8/17
The ratio of ball diameters is 8/17.
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