Instructions: 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.
Input: Passage: The PRI, or Institutional Revolutionary Party is one of the major lasting legacies of the Mexican Revolution; its first iteration was the Partido Nacional Revolucionario founded in 1929 under Northern revolutionary general and president of Mexico Plutarco Elias Calles, following the assassination of president-elect Alvaro Obregon in 1928. The establishment of the party created an enduring structure that managed not only presidential succession but also groups with competing interests. Initially, Calles remained the power behind the presidency during a period known as the Maximato, but his hand-picked presidential candidate, Lazaro Cardenas, won a power struggle with Calles, expelling him from the country. Cardenas reorganized the party that Calles founded, creating formal sectors for interest groups, including one for the Mexican military. The reorganized party was named Party of the Mexican Revolution. In 1946, the party again changed its name to the Institutional Revolutionary Party. The party under its various names held the presidency from 1929 to 2000 and since 2012, is the party again in power.
Output:
How many years after the assassination of Alvaro Obregon was the Partido Nacional Revolucionario founded?