Input: Read this: The iconic New York City Subway system is the largest rapid transit system in the world when measured by stations in operation, with 469, and by length of routes. New York's subway is notable for nearly the entire system remaining open 24 hours a day, in contrast to the overnight shutdown common to systems in most cities, including Hong Kong, London, Paris, Seoul, and Tokyo. The New York City Subway is also the busiest metropolitan rail transit system in the Western Hemisphere, with 1.75 billion passengers rides in 2014, while Grand Central Terminal, also popularly referred to as "Grand Central Station", is the world's largest railway station by number of train platforms.
Question: How many stations does the New York City Subway system contain?

Output: 469

QUES: Foreign direct investment (FDI) in Egypt increased considerably before the removal of Hosni Mubarak, exceeding $6 billion in 2006, due to economic liberalisation and privatisation measures taken by minister of investment Mahmoud Mohieddin.[citation needed] Since the fall of Hosni Mubarak in 2011, Egypt has experienced a drastic fall in both foreign investment and tourism revenues, followed by a 60% drop in foreign exchange reserves, a 3% drop in growth, and a rapid devaluation of the Egyptian pound.

What has been the change in foreign exhange reserves since 2011?
What is the answer?
ANS: 60% drop

QUES: Central State-owned enterprises have accumulatively donated more than $48.6 million. China National Petroleum Corp and Sinopec donated 10 million yuan each to the disaster area.
How much have Central state enterprises donated?

ANS: 48.6 million

On March 15, 1915,:8 Laemmle opened the world's largest motion picture production facility, Universal City Studios, on a 230-acre (0.9-km) converted farm just over the Cahuenga Pass from Hollywood. Studio management became the third facet of Universal's operations, with the studio incorporated as a distinct subsidiary organization. Unlike other movie moguls, Laemmle opened his studio to tourists. Universal became the largest studio in Hollywood, and remained so for a decade. However, it sought an audience mostly in small towns, producing mostly inexpensive melodramas, westerns and serials.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): In square kilometers, what was the size of Universal City Studios?
Ah, so.. 0.9

Question: To prevent the risk of out-of-phase supplies mixing, sections of line fed from different feeder stations must be kept strictly isolated. This is achieved by Neutral Sections (also known as Phase Breaks), usually provided at feeder stations and midway between them although, typically, only half are in use at any time, the others being provided to allow a feeder station to be shut down and power provided from adjacent feeder stations. Neutral Sections usually consist of an earthed section of wire which is separated from the live wires on either side by insulating material, typically ceramic beads, designed so that the pantograph will smoothly run from one section to the other. The earthed section prevents an arc being drawn from one live section to the other, as the voltage difference may be higher than the normal system voltage if the live sections are on different phases and the protective circuit breakers may not be able to safely interrupt the considerable current that would flow. To prevent the risk of an arc being drawn across from one section of wire to earth, when passing through the neutral section, the train must be coasting and the circuit breakers must be open. In many cases, this is done manually by the drivers. To help them, a warning board is provided just before both the neutral section and an advance warning some distance before. A further board is then provided after the neutral section to tell drivers to re-close the circuit breaker, although drivers must not do this until the rear pantograph has passed this board. In the UK, a system known as Automatic Power Control (APC) automatically opens and closes the circuit breaker, this being achieved by using sets of permanent magnets alongside the track communicating with a detector on the train. The only action needed by the driver is to shut off power and coast and therefore warning boards are still provided at and on the approach to neutral sections.
Try to answer this question if possible: How were the drivers warned to start coasting the train?
Answer: warning board

Problem: The struggle related to the constitutional movement continued until 1911, when Mohammad Ali Shah was defeated and forced to abdicate. On the pretext of restoring order, the Russians occupied Northern Iran in 1911, and maintained a military presence in the region for years to come. During World War I, the British occupied much of Western Iran, and fully withdrew in 1921. The Persian Campaign commenced furthermore during World War I in Northwestern Iran after an Ottoman invasion, as part of the Middle Eastern Theatre of World War I. As a result of Ottoman hostilities across the border, a large amount of the Assyrians of Iran were massacred by the Ottoman armies, notably in and around Urmia. Apart from the rule of Aqa Mohammad Khan, the Qajar rule is characterized as a century of misrule.
The British occupied Western Iran from World War 1 until finally withdrawing in what year?
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Answer:
1921