Detailed Instructions: You need to read the given passage and construct a question about the information present in the passage. The question should be answerable from the passage. Most importantly, only those questions are allowed whose answers cannot be determined from a single sentence. Do not generate questions that require only a single sentence to answer. Instead, try to combine two sentences and create a question from that combination. Do not create open-ended questions, i.e., the answers to them cannot be found precisely from the information provided in the passage.
Problem:Paragraph- Sent 1: (CNN) -- Somali pirates hijacked a yacht with four Americans onboard in the Indian Ocean, U.S. military officials said Saturday.
Sent 2: The identities of the Americans were not immediately known, but the yacht, the S/V Quest, is owned by Jean and Scott Adam, according to Ecoterra International.
Sent 3: It is not clear whether the Adams -- who were on a worldwide cruise -- are onboard.
Sent 4: The U.S. military is prepared to intervene in the situation if necessary, said Rear Adm. Charles Gaouette, deputy commander of the U.S. Navy's Fifth Fleet, based in Bahrain.
Sent 5: "They were part of a sailing group that set sail from the southern tip of India into the western Indian Ocean," he said, adding that the situation is being monitored with U.S. Central Command.
Sent 6: Gaouette said there is no reason to believe the hijacked yacht has been taken to the coastline of Somalia yet, though pirates in the region have been known to do so.
Sent 7: Another U.S. official, who asked not to be named due to the sensitivity of the situation, said the United States is determining what military assets are in the region and the capabilities of the personnel onboard.
Sent 8: The official said that the pirates are believed to be onboard the yacht with the Americans, and the next step would be to determine whether the military could keep the yacht from reaching the shore -- either by blocking or harassing it.
Sent 9: Authorities said the yacht was en route from India to Oman when it was captured Friday.
Sent 10: The Adams' website documents their worldwide voyage, which started in late 2004.
Sent 11: It includes trips to New Zealand, China, Cambodia and Panama.
Sent 12: "If the owners are onboard, it would be a sad log for the couple on their seven-year world journey," Ecoterra said.
Sent 13: The Adams were traveling with a group of somewhere between 14 and 30 other yachts taking part in what's called the Blue Water Rally, said Scott Stolnitz, a boater who described himself as a longtime friend of the couple.
Solution:
How many Americans were on the S/V Quest?