Whats a Plough?
If 16 horses can plough 1280 acres in 8 days,
how many acres can 12 horses plough in 5 days?
Solution: Suggested Solution (Bobby Gohl & Michael Mills, WWU students)
H = horses, A = acres, D = days
16H * 12D = 1280A
16H = 160 A/D
H = 10 A/D
12H = 120 A/D
12H * 5D = 600 A
In words, if 16 horses can plow 1280 acres in 12 days, then the same 16 horses can plow 160 acreas/day, and 1 horse can plow 10 acres/day.
If you have 12 horses, then you can plow 120 acres/day, and if you plow for 5 days, then you plow 600 acres.
Source: Charles Pendlebury's Arithmetic (London: G. Bell & Son, 1918)