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.

Passage: On 17 December 1297, the three brothers overthrew Kyawswa, and founded the Myinsaing Kingdom. At Pagan, Kyawswa's son Sawhnit was elected king by the dowager Queen Saw but soon became a governor under the authority of Myinsaing. Another of Kyawswa's sons, Kumara Kassapa, escaped to China. The Mongols did not know about the dethronement until June-July 1298. In 1300, the Myinsaing forces led by Athinkhaya attacked the Mongol garrisons north of Mandalay named Nga Singu and Male. On 22 June 1300, the Mongol Emperor declared that Kumara Kassapa was the rightful king of Burma, and sent in an army from Yunnan. The invasion force reached Myinsaing on 25 January 1301 but could not break through. The besiegers took the bribes by the three brothers, and withdrew on 6 April 1301. The Mongol government at Yunnan executed their commanders but sent no more invasions. They withdrew entirely from Upper Burma starting on 4 April 1303. By then, the city of Pagan, once home to 200,000 people, had been reduced to a small town, never to regain its preeminence. The brothers placed one of Kyawswa's sons as the governor of Pagan. Anawrahta's line continued to rule Pagan as governors under Myinsaing, Pinya and Ava kingdoms until 1369. The male side of Pagan ended there although the female side passed into Pinya and Ava royalty. But the Pagan line continued to be claimed by successive Burmese dynasties down to the last Burmese dynasty Konbaung.
How many Mongol garrisons did Myinsaing forces attack in 1300?