This task involves creating questions from a given passage that involve some kind of complex reasoning (including numerical reasoning).
The generated questions must require looking at more than one part of the passage to answer. Try to use a variety of reasoning types in your questions (some of the sample reasoning types are illustrated in the 'positive examples' field) and also have a variety of answer types (spans, numbers, dates). A span is a continuous phrase taken directly from the passage or question. In such questions, the answer spans are recommended to be five words. Questions with answer type "number", are expected to start with "How many". For instance, "How long did an event last?" can be phrased as "How many years did an event last?". To increase diversity, try to create more questions for which the answer will be multiple spans. Please create questions that require AT LEAST 2 arithmetic operations as illustrated in the 'positive examples' field. You are encouraged to try DIFFERENT COMBINATIONS of operations and not just limit to the combinations shown in those examples. The more challenging questions you create, the better it is.
Q: Passage: The Finnish Red Guards seized the early initiative in the war by taking control of Helsinki on 28 January 1918 and by undertaking a general offensive lasting from February till early March 1918. The Reds were relatively well armed, but a chronic shortage of skilled leaders, both at the command level and in the field, left them unable to capitalise on this momentum, and most of the offensives came to nothing. The military chain of command functioned relatively well at company and platoon level, but leadership and authority remained weak as most of the field commanders were chosen by the vote of the troops. The common troops were more or less armed civilians, whose military training, discipline and combat morale were both inadequate and low. Ali Aaltonen was replaced on 28 January 1918 by Eero Haapalainen as commander-in-chief. He, in turn, was displaced by the Bolshevik triumvirate of Eino Rahja, Adolf Taimi and Evert Eloranta on 20 March. The last commander-in-chief of the Red Guard was Kullervo Manner, from 10 April until the last period of the war when the Reds no longer had a named leader. Some talented local commanders, such as Hugo Salmela in the Battle of Tampere, provided successful leadership, but could not change the course of the war. The Reds achieved some local victories as they retreated from southern Finland toward Russia, such as against German troops in the Battle of Syrjantaka on 28-29 April in Tuulos.
A:
How many days did the Battle of Syrjantaka last?