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 133 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 3 of the number of that he had.

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1 half is 3,

180. This must be reduced to 6ths. and is, and the number itself is §. If therefore to the whole number its half and its third be added, the sum will be ; hence, 77 is of the number.

181.is; therefore if to a number and of itself be added, the whole number will be ; but when 18 more is added to, the first number is doubled; that is, the number is of the first number; therefore 18 is of the number