11. How much wine, at 12 doll. pr. gal. with molasses, at doll. pr. gal. and of each an equal quantity, must be had in exchange, for 35 gallons of brandy, at $ 2,25, pr. gal. and 10 gallons of old spirits, at $1,121 pr. gal.? Ans. 40 gallons.

COMPOUND ADDITION.

Teaches to unite several numbers of different denominationsas pounds, shllings, pence, &c. into one sum.

RULE.*

1. Place numbers of the same denomination under each other.

2. Add the figures in the right hand column, and find how many of the next denomination are contained in the sum, which carry to the next denomination; observing to set down the remainder under the column added, and thus proceed with all the columns excepting the last, where the whole sum is to be written down.

* The reason of this rule will be obvious, if we consider, that 1 in the column of pence, is equal to 4 in the column of farthings, and 1 in that of shillings, to 12 in the column of pence &c.

Teaches to find the difference between any two sums of different denominations.

RULE.

Place numbers of the same denomination under each other, the less below the greater; begin with the least denomination, and if it exceed the figure above it, borrow as many units as make one of the next greater; subtract it therefrom, add the upper figure to the difference; always adding one to the next higher denomination for that which you borrowed. PROOFthe same as in Simple Subtraction.

1. STERLING MONEY.