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.

Let me give you an example: Passage: The outbreak of the Seven Years' War in Europe in 1756 resulted in renewed conflict between French and British forces in India. The Third Carnatic War spread beyond southern India and into Bengal where British forces captured the French settlement of Chandernagore in 1757. However, the war was decided in the south, where the British successfully defended Madras, and Sir Eyre Coote decisively defeated the French, commanded by Comte de Lally at the Battle of Wandiwash in 1760. After Wandiwash, the French capital of Pondicherry fell to the British in 1761. The war concluded with the signing of the Treaty of Paris in 1763, which returned Chandernagore and Pondichery to France, and allowed the French to have "factories" in India but forbade French traders from administering them. The French agreed to support British client governments, thus ending French ambitions of an Indian empire and making the British the dominant foreign power in India.
The answer to this example can be: Which french settlement did the British capture first, Chandernagore or Pondicherry?
Here is why: This is a good question since it involves a comparison around a particular event, "British capturing the French settlement", which requires looking at more than a single sentence.

OK. solve this:
Passage: Of the estimated 30,000 to 40,000 people who reached Dawson City during the gold rush, only around 15,000 to 20,000 finally became prospectors. Of these, no more than 4,000 struck gold and only a few hundred became rich. By the time most of the stampeders arrived in 1898, the best creeks had all been claimed, either by the long-term miners in the region, or by the first arrivals of the year before. The Bonanza, Eldorado, Hunker and Dominion Creeks were all taken, with almost 10,000 claims recorded by the authorities by July 1898; a new prospector would have to look further afield to find a claim of his own. Geologically, the region was permeated with veins of gold, forced to the surface by volcanic action and then worn away by the action of rivers and streams, leaving nuggets and gold dust in deposits known as placer gold. Some ores lay along the creek beds in lines of soil, typically 15 feet to 30 feet beneath the surface. Others, formed by even older streams, lay along the hilltops; these deposits were called "bench gold". Finding the gold was challenging. Initially, miners had assumed that all the gold would be along the existing creeks, and it was not until late in 1897 that the hilltops began to be mined. Gold was also unevenly distributed in the areas where it was found, which made prediction of good mining sites even more uncertain. The only way to be certain that gold was present was to conduct exploratory digging.
Answer:
Approximately how many prospectors did not actually strike gold?