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.

Passage: Forecasting airline interest in larger-capacity models, Boeing announced the stretched 767-300 in 1983 and the extended-range 767-300ER in 1984. Both models offered a 20 percent passenger capacity increase, while the extended-range version was capable of operating flights up to . Japan Airlines placed the first order for the 767-300 in September 1983. Following its first flight on January 30, 1986, the type entered service with Japan Airlines on October 20, 1986. The 767-300ER completed its first flight on December 9, 1986, but it was not until March 1987 that the first firm order, from American Airlines, was placed. The type entered service with American Airlines on March 3, 1988. The 767-300 and 767-300ER gained popularity after entering service, and came to account for approximately two-thirds of all 767s sold.
How many months after the first flight of the 767-300 was the first flight of the 767-300ER?

Passage: On 2 May, 1687, a Russian army of about 132,000 soldiers, led by knyaz Vasily Golitsyn, left Okhtyrka on the Belgorod Line. On 30 May they were joined by 50,000 Left Bank Cossacks under hetman Ivan Samoilovich at the mouth of the Samora River where the Dnieper turns south. In the heat of summer, 180,000 men, 20,000 wagons and 100,000 horses set out down the east bank of the Dnieper. The huge force, which started too late and was perhaps not well organized,  could only travel about 10km per day. When the Russians reached the Konskiye Vody river on the west-flowing part of the Dnieper, they found that the Tatars has set fire to the steppe . After a few days of marching over burnt land, their horses were exhausted, they were short of water and 130 miles from their goal at Perekop, however Golitsyn built a fortress at Novobogoroditskoe at the junction of the Dnieper and the Samara. On 17 June they decided to turn back.
How many days after a Russian army of about 132,000 soldiers led by knyaz Vasily Golitsyn left Okhtyrka did they decide to turn back?

Passage: In 1856, Leopold II, Grand Duke of Tuscany established a penal colony in Pianosa because it was considered a perfect place to isolate, segregate, and oversee detainees; at the proclamation of the Kingdom of Italy in 1861, there were 149 prisoners on the island. In 1864 a structure able to contain 350 prisoners was built, but in 1872 the island was divided into numerous farms organizing the inmates as small communities; in 1880 there were 960 detainees. The captives cultivated cereals, produced oil and wine as Sangiovese and Procanico, there were poultry, pigs, and cattle farms. From 1884 until 1965, because of its dry climate, Pianosa hosted convicts from all over Italy who had been affected by tuberculosis. At the beginning of the 1900s, the population on the island was 21 civilians, 80 Polizia Penitenziaria, 40 soldiers, and 800 prisoners. The former President of the Republic of Italy Sandro Pertini became an inmate in 1932 for political reasons. During World War II, on 17 September 1943, Germans troops invaded Pianosa and occupied it; on 19 March 1944 French commandos landed on the island, and after a short firefight left again, taking away 40 prison guards as hostages; the following month an allied bomber attacked the island, killing six people.

How many more Polizia Penitenziaria were there than civilians and soldiers?