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152. A and B can build of it in 1 day; A, B, and C. can build ¦ of it in I day, the difference between and is; therefore C can build of it in 1 day; and it would take him 134 days to build it alone.

164. Find how much they might eat in a day, in order to make it last 1 month, and then it will be easy to find how much they may eat in a day to make it last 11 months.

167. The money is 7 parts of the whole, and the purse one part; consequently the money is 7, and the purse of 16.

170. He gave 1 part for the apple, 2 parts for the orange, and 4 parts for the melon. These make 7 parts. The apple 3 cents, the orange 6

cents, and the melon 12 cents.

175. If to a number half of itself be added, the sum is of that number; hence, subtract 2 from 100 and the remainder is of the number of geese that he had.

180. This must be reduced to 6ths. 1 half is †, and is, and the number itself is g. If therefore to the whole number its half and its third be added, the sum will be ; hence, 77 is of the number. 11 181. is; therefore if to a number and of itself be added, the whole number will be 1; but when 18 more is added to 7, the first number is doubled; that is, the number is & of the first number; therefore 18 is of the number

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