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

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XXVI
1. See Section IV. pp. 17, 18. 2. Section IV. p. 17. 3. Take the years between
the births of the eldest sons. 4. 1507 years.
XXVII.
1. 2277 weeks 4 days 6hrs. 20min. 2. lhr. 53min. 20sec. 3. 9072 shots.
4. 19min. 5. The average yearly increase per cent. for each of the 10 years was
3199. 6. That which costs 15s. is the cheaper by 5s. in a year.
XXVIII.
1. Half a second. 2. 216000 vibrations. 3. As 15~ of longitude correspond to
1 hour of time, the equivalent in time is 3hrs. 57min. 50sec. 4. 8hrs. 48min.
5. 4hrs. 40min. 56sec.
XXIX.
1. 100 weeks. 2. 20 days. 3. Between 40 and 41 miles an hour. 4. 2160
revolutions. 5. One has walked 1600 feet, and the other 1500 feet. 6. 3hrs. 46min.
7. 3 miles 220 yds.
XXX.
1. Above 68040 miles an hour. 2. Light moves more than 184000 miles in one
second of time. 3. 1034 miles an hour at the equator, and 630 miles an hour in the
latitude of London. 4. 928155375 seconds. 5. Saturn's year is between 84 and
85 years of the earth. 6. More than 157, but less than 158 years of Jupiter.
8. Between 9 and 10 years.
XXXI.
1. The question implies that the 18th June is to be omitted: there are 168 days
before, and 196 days after that day. 2. 116 days. 3, 33 years. 4. Section IV. pp.
17, 18. 5. 26 years. 6. In 1845 C was 25 years of age, A 30, and B 40. In 1865
B will be 60 years of age. 8. See Section IV. pp. 17, 18. 9. Find the time between
Jan. 26, 1858, 9hrs. 13min. a.m., and the same point of time a.m. on Dec. 31, 1873.
Ascertain how many intervals occur in that period, reckoning the first full moon
from June 26th, 1858.
10. See Section IV. pp. 17, 18.