- 22 : 156 ∷ 17 . 4
- 156(227)
- 22) £135 . 4 . 0(£6 . 2 . 10¾-⁷/₁₁ (228)
- 132
- 3 × 20 + 4 = 64
- 44
- 20 × 12 = 240
- 220
- 20 × 4 = 80
- 66
- 14
The student must learn by practice which is the most convenient method for any particular case, as no rule can be given.
- It may happen that the three given quantities are all of one denomination; nevertheless it will be found that two of them are of one, and the third of another sort. For example: What must an income of £400 pay towards an income-tax of 4s. 6d. in the pound? Here the three given quantities are, £400, 4s. 6d., and £1, which are all of the same species, viz. money. Nevertheless, the first and third are income; the second is a tax, and the answer is also a tax; and therefore, by (152), the quantities must be placed thus:
£1 : £400 ∷ 4s. 6d.
- The following exercises either depend directly upon this rule, or can be shewn to do so by a little consideration. There are many questions of the sort, which will require some exercise of ingenuity before the method of applying the rule can be found.
EXERCISES.
If 15 cwt. 2 qrs.