instruction:
This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.
question:
After 1870, the new railroads across the Plains brought hunters who killed off almost all the bison for their hides. The railroads offered attractive packages of land and transportation to European farmers, who rushed to settle the land. They (and Americans as well) also took advantage of the homestead laws to obtain free farms. Land speculators and local boosters identified many potential towns, and those reached by the railroad had a chance, while the others became ghost towns. In Kansas, for example, nearly 5000 towns were mapped out, but by 1970 only 617 were actually operating. In the mid-20th century, closeness to an interstate exchange determined whether a town would flourish or struggle for business.
answer:
after about what year did railroads bring hunters to the great plains?


question:
Bonaparte began with an army of 13,000 men; 1,500 were reported missing, 1,200 died in combat, and thousands perished from disease—mostly bubonic plague. He failed to reduce the fortress of Acre, so he marched his army back to Egypt in May. To speed up the retreat, Bonaparte ordered plague-stricken men to be poisoned with opium; the number who died remains disputed, ranging from a low of 30 to a high of 580. He also brought out 1,000 wounded men. Back in Egypt on 25 July, Bonaparte defeated an Ottoman amphibious invasion at Abukir.
answer:
How many men were in Napoleon's army when the battle began?


question:
The City of Plymouth is divided into 20 wards, 17 of which elect three councillors and the other three electing two councillors, making up a total council of 57. Each year a third of the council is up for election for three consecutive years – there are no elections on the following "fourth" year, which is when County Council elections take place. The total electorate for Plymouth was 188,924 in April 2015. The local election of 7 May 2015 resulted in a political composition of 28 Labour councillors, 26 Conservative and 3 UKIP resulting in a Labour administration. Plymouth City Council is formally twinned with: Brest, France (1963), Gdynia, Poland (1976), Novorossiysk, Russia (1990) San Sebastián, Spain (1990) and Plymouth, United States (2001).
answer:
How many wards in Plymouth elect two councillors?