Quoting%20commentary for Bekhorot 99:8

דהוי להו עשרין מתקלי במתקלי דינרא דאינון עשרין ותמניא זוזי ופלגי ופלגא דנקא

is the amount for the redemption of the first-born which is twenty times the weight of a [Tyrian] denar, and which makes twenty-eight and a half zuz and a half danka.<span class="x" onmousemove="('comment',' According to the Arabian denar, because seven Tyrian denars make ten Arabian denars, therefore fourteen Tyrian denars make twenty Arabian denars. The remaining six denars (to complete the twenty denars i.e., the twenty zuz, a denar being identified with a zuz) make eight and a half denars and a half of a danka i.e., a dupondium. For since every denar contains twelve dupondia and the proportion between a Tyrian and an Arabian coin is as ten to seven, one Tyrian denar will therefore be seventeen and a seventh dupondia, a surplus of five and one-seventh dupondia over the Arabian standard. Consequently, for the remaining six Tyrian dears we have a surplus, according to the Arabian standard, of thirty-one dupondia minus a negligible amount. These thirty-one dupondia make two and a half denars plus one dupondium. Therefore six Tyrian denars make eight and a half Arabian denars plus one dupondium and together with the fourteen Tyrian denars which equal twenty Arabian denars, we have thus in twenty Tyrian denars the equivalent of twenty-eight and a half Arabian denars plus a half of a danka viz., one dupondium.');">⁶</span>

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