A material has a mass of 187 g and 140 g before and after abrasion, respectively. If the material
has a circular cross-section of 5 cm diameter, find the abrasive ratio.
Abrasive ration= Mass after abrasion/ Mass before abrasion
Abrasive ration= 140187\frac{140}{187}187140
Abrasive ratio= 0.749
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