Education > Complete treatise on practical arithmetic and book-keeping

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RULE-OF-THREE
IN VULGAR FRACTIONS,
XT.AVING made the necessary preparations far Multi pi
cation, multiply continually together the 2d and 2d term
and the reciprocal of the 1st, for the answer.
Examples.
1. If f of a yard of velvet cost {7, what will of a yar
cost?
T': T *! T?7: Ans.
b 5 16 ^xgx‘3, 3
Note. In this solution, having represented the 4th term in the fori
of a compound fraction, by expressing the continual product of the 2
term, and Sd term, and reciprocal of the 1st, as must always be dom
then let the terms be always abbreviated as much as possible, befoc
the actual multiplicatign and division; so here the one o cancels th
other, and the 16 cancels the 2 and the 8, leaving onJy one third fd
the simple value of the 4th term required.
2. What will oz of silver cost at 6s id an ounce ?
Ans. U Is i{<i
3. If of a ship be wTorth 273/ 2s 6d, what is of he
worth? - - ... Ans. 227/ 12s la
4. What will 13jlb cost at the rate of 17|/ per cvvt?
’ Ans. 2/
5. What is the purchase of 1230/ bank-stock, at 108| pe
cent. ? - - - Ans. 1336/ Is 9a
6. What is the interest of 273/ loS for a year, at S-*- pe-
cent. ? ... Ans. 8/ 17s Ibjd
7- If | of a ship be wortli 73/Is St/, what part of he;
may I buy for 250/ 10s ? - - Ans. X of her ,
8. What must be paid for 5£ oz, at the rate of 5\s per II .
troy ? - - - Ans. 2s 6TVd;
9. How much India-stock may be bought for 30ill 2
3d, at 172i/ per cent. ? - Ans. 1760/ 8.s 2d 3-s\{q ■>
10. What does the commission of 530/ 2.s 9c/ amount tc
at 2s Qd per cent. ? - - . Ans. 13s 3TVVJ ♦