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The width of the line drawn by a ball-point pen is the measurement I assume you meant. Though it is often given in fractions of a millimetre, fine, medium or thick is usually used.
right around 220# but that is not the exact answer, it is in the ball park
100 - 30 = 70
For multiplication or division, 133.33... or 100*4/3
Put an exact amount of water in a measuring cup. Drop in a golf ball. The increase in water level equals the volume of the golf ball, assuming the ball doesn't float. For example, 200mL before ball. 280ml after ball dropped in. Therefore volume equals 40ml or 40 Cubic Centimeters.