Elementary arithmetic, with brief notices of its history... by Robert Potts.

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XVIII.
1. The relative values of gold and silver are as 1869 to 124; or gold is in value
a little more than 15 times the same weight of silver.
2. ~114.-1
3. The weight of the wedge of gold is found by dividing its value by the value of
olle Ounle.
4. See question 7 above under XVII.
5. The relative values are as 725 to 57[.
6. The proportion is 27 to 1.
XIX.
1. A quarter of corn in France costs 3842 shillings.
2. One cubic foot of water weighs 6 X 20 X 14 pounds Avoirdupois, anct
1000 x 1000 kilogrammles
1131
3. ~256 7s. 107d. 4. 21l feet. 5. ~731 Is. 4~d. 6. ~50 Is. 8d1.
XX.
1. 70 days. 2. 27~-7'-4 weeks. 3. 45 men to be added. 4. 156, days..
5. ~31,. 6. ~125. 7. ~50 10s. 8. 108 days. 9. 98 labourers.
XXI.
1. 24 dlays. 2. 11- hours. 3. 19'72 English miles. -4. -o-y?- of one inch,,
which is greater than -, but less than J-. 5. 46}- feet. Euclid VI. 4.
6. The equatorial diameter is equal to 299.33X7899114 miles.
283.33
7. The ratio of one metre to one foot is 3'28035.
8. If lunarian eyes have the same powers of vision as sublunarian eyes, theapparent disks will be proportional to the squares of the diameters of the earth andl
moon, and one will appear 16 times as large as the other.