[G:71r]

163 De⁴²⁵ cantare vendito⁴²⁶ per libras, cum queritur merces denariorum

Item cantare valet libras \({1 \over 9}\) \({2 \over 5}\) 13, et quantum quis pro denariis \({1 \over 4}\) 9 habuerit queratur, hoc est per \({1~~\phantom{1}9~~\phantom{1}0 \over 4~~12~~20}\) unius libre, ut fiant ex eadem quantitate librarum \({1 \over 9}\) \({2 \over 5}\) 13. Describatur questio ut hic ostenditur, et multiplica 13 per suas virgulas; erunt 608 164 Item multiplica 9 que

608 ℞ \({1 \over 9}\) \({2 \over 5}\) \(13\) 100 37   \({1~~\phantom{1}9~~\phantom{1}0 \over 4~~12~~20}\) \({2~~2~~0~~\phantom{1}8~~\phantom{1}3 \over 4~~8~~8~~19~~12}\)

⁴²⁷ sunt super 12 per 4 et adde 1; erunt 37. Et multiplica 37 per 100, que per 5 et per 9 que sunt sub [R:68v] virgulis post 13, et divides summam per regulam de 608, que est \({1~~0~~0 \over 4~~8~~19}\), et per \({1~~\phantom{1}0~~\phantom{1}0 \over 4~~12~~20}\), qui rupti insimul coaptati sunt \({1~~0~~0~~\phantom{1}0~~\phantom{1}0~~\phantom{1}0 \over 4~~8~~8~~1019~~12}\), et habebis quesitam quantitatem. 165 Vel si volueris evitare, noli multiplicare 37 per totum 100, sed relinques 10 de regula de⁴²⁸ 100, propter quod relinques \({1 \over 10}\) que est in virgula divisionis. Ergo multiplicabis 37 per 10 que remanent de 100 et per 5 et per 9 predicta; erunt 16650, que divide per \({1~~0~~0~~\phantom{1}0~~\phantom{1}0 \over 4~~8~~8~~19~~12}\)⁴²⁹: exibunt \({2~~2~~0~~8~~3 \over 4~~8~~8~~19~~12}\).

166 Item si centenarium vendatur pro soldis \({1 \over 8}\) \({2 \over 3}\) 17,

427 £ l. \({1~~2~~17 \over 8~~3~~20}\) 100 501   \({1 \over 7}\) \({3 \over 4}\) 17 \({5~~3~~30~~\phantom{1}4 \over 7~~7~~61~~12} 2011\)

⁴³⁰ et queratur quantum quis ex ipsa merce⁴³¹ pro libris \({1 \over 7}\) \({3 \over 4}\) 17 habuerit⁴³², verte soldos \({1 \over 8}\) \({2 \over 3} 17\) [F:41v] ad partes unius libre: erunt \({1~~2~~17 \over 8~~3~~20}\) unius libre, et hoc facies ut ambo numeri sint unius nominis. Deinde describes questionem in hunc modum, et operaberis⁴³³ secundum quod superius dictum est, et habebis pro quesita quantitate illius⁴³⁴ mercis libras \({5~~3~~30~~\phantom{1}4 \over 7~~7~~61~~12}\) 2011.