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.
--------
Question: Passage: Today, on the site of the martyrdom of the hot throne, there is the statue of The Virgin Mary, built by architect László Székely and sculptor György Kiss. According to the legend, during György Dózsa's torture, some monks saw in his ear the image of Mary. The first statue was raised in 1865, with the actual monument raised in 1906.  Hungarian opera composer Ferenc Erkel wrote an opera, Dózsa György, about him. His revolutionary image and Transylvanian background were drawn upon during the Communist regime of Gheorghe Gheorghiu-Dej. The Hungarian component of his movement was downplayed, but its strong anti-feudal character was emphasized. In Budapest, a square, a busy six-lane avenue, and a metro station bear his name, and it is one of the most popular street names in Hungarian villages. A number of streets in several cities of Romania were named Gheorghe Doja. Also, a number of streets in serval cities of Serbia were named "Ulica Doža Đerđa".Two Postage stamps were issued in his honor by Hungary on 12 June 1919 and on 15 March 1947, the latter in the "social revolutionists" series.

Answer: How many places in Budapest bear Gheorghe Gheorghiu-Dej name?


Question: Passage: Detroit advanced to the NBA Conference Finals for the sixth straight season, squaring off against the Celtics. This put the Pistons second on the all-time list of most consecutive conference finals appearances, only behind the Los Angeles Lakers who appeared in eight straight conference finals from the 1981-82 to 1988-89 seasons. They lost Game 1 88-79, but won in Game 2 on the road, 103-97, marking the Celtics first home court loss in the  postseason. Immediately following that, the Celtics won their first road game of the postseason, 94-80, in Game 3. Game 4 saw the Pistons win 94-75. In the pivotal Game 5, they lost 106-102, despite rallying from 17 points down late in the game. In Game 6, the Pistons entered the fourth quarter leading 70-60, but a lack of focus, a poor game from Rasheed Wallace, and a rally-killing turnover by Tayshaun Prince ultimately led to their demise; the Pistons ended their season with an 89-81 loss. After that, the Celtics went on to win the 2008 NBA Finals. On June 3, 2008, the Pistons announced that Flip Saunders would not return as head coach.

Answer: How many playoff games did the Pistons play in 2008?


Question: Passage: In the 17th century there were many of these independent local bodies levying their own taxes and administering justice. This early form of local government played a role in the development of a political system in the Netherlands that was decentralised and dependent on communal cooperation. Widespread experience with decentralized government was a factor in the formation of the Dutch Republic in the 16th and 17th centuries. The mandate of Rijkswaterstaat , established in 1798 under French rule, was to centralise water control in the Netherlands. Local water boards refused to give up their autonomy however, so Rijkswaterstaat ended up working alongside the local water boards. Today Rijkswaterstaat has responsibility for major water control structures and other infrastructure like motorways. By 1850 there were about 3,500 water boards in the country. In modern times water boards merged as they dealt with joint  interests. Mergers eventually reduced the number to 25 water boards in 2011. The tasks of water boards remain basically unchanged. Having a rich history dating back to the Middle Ages, they are the oldest governing bodies and the oldest democratic institutions in the Netherlands. Dutch water boards have their own coat of arms, a colourful reminder of their importance in Dutch history. The historic buildings that used to house the water boards are another legacy. Called gemeenlandshuis or waterschaphuis, these charming old buildings can be found at the heart of many Dutch towns.

Answer:
By how many water boards had the countries water boards decreased by from 1850 to 2011?