In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Passage: The first obelisks may start to appear in the later 16th century and it is suggested that the obelisk on Compton Pike is Elizabethan in date. More securely dated is a series of obelisks which start to appear in the 18th century. The first of these was the Wakeman obelisk of 1702 by Nicholas Hawksmoor, which is set in the square at Richmond, Yorkshire. Probably several hundred obelisks exist in the British Isles dating from 18th and early 19th centuries. Most of these obelisks, which are often landmarks commemorate famous people and their achievements. At Stowe in Buckinghamshire an obelisk was erected in memory of Wolfe's victory at Quebec in 1752, while at the death of the Duke of Cumberland in 1765 was noted by an obelisk at Englefield Green in Surrey. Thomas Coke, Earl of Leicester, Coke of Norfolk the farming pioneer has a particularly fine obelisk, set up in the park he created at Holkham in Norfolk. Sometimes an obelisk was used to mark the site of a battle such as the obelisk on the site of English Civil War battlefield at Naseby in Leicestershire. Occasionally obelisks are used as mile markers, as on the Great North Road at a mile from Westminster. In Lincoln an elaborate obelisk was set up on the High Bridge in 1762–63 as a conduit for dispensing water, while Anthony Salvin used obelisks as water fountains on the Belton House estates in Lincolnshire.
 Link Information: Nicholas Hawksmoor (probably 1661 – 25 March 1736 Question: What was architect's  age when the Wakeman obelisk was set in the square at Richmond, Yorkshire?
Answer: 41

Passage: Lord Jersey married Lady Sarah Sophia Fane, daughter of John Fane, 10th Earl of Westmorland, on 23 May 1804. She was the eldest grandchild and heiress of Robert Child, principal shareholder of the banking firm Child & Co. Lord Jersey added the surname Child to the Villiers surname by royal licence in 1819. Lady Jersey was one of the great hostesses of English society, a leader of the ton during the Regency era and the reign of George IV, and a patroness of Almack's. Lord Jersey was an ardent fox hunter and a breeder and trainer of horses, owning two Epsom Derby winners, in Mameluke (1827) and Bay Middleton (1836) as well as other notable thoroughbreds such as Glencoe. His wife's numerous love affairs did not trouble him: asked why he had never fought a duel to protect her honour, he replied that he could hardly fight every man in London.
 Link Information: none Question: Who did George Lady Sarah Sophia Fan heir Child & Co. to?
Answer: none

Passage: Born in Braintree, Massachusetts, Adams spent much of his youth in Europe, where his father served as a diplomat. After returning to the United States, Adams established a successful legal practice in Boston. In 1794, President George Washington appointed Adams as the U.S. ambassador to the Netherlands, and Adams would serve in high-ranking diplomatic posts until 1801, when Thomas Jefferson took office as president. Federalist leaders in Massachusetts arranged for Adams's election to the United States Senate in 1802, but Adams broke with the Federalist Party over foreign policy and was denied re-election. In 1809, Adams was appointed as the U.S. ambassador to Russia by President James Madison, a member of the Democratic-Republican Party. Adams held diplomatic posts for the duration of Madison's presidency, and he served as part of the American delegation that negotiated an end to the War of 1812. In 1817, newly-elected President James Monroe selected Adams as his Secretary of State. In that role, Adams negotiated the Adams–Onís Treaty, which provided for the American acquisition of Florida. He also helped formulate the Monroe Doctrine, which became a key tenet of U.S. foreign policy.
 Link Information: The Adams–Onís Treaty () of 1819 Question: How many months or years passed between the signing of the Adams-Onis Treaty and the formulation of the Monroe Doctrine?

Answer: 4