You will be given a definition of a task first, then some input of the task.
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: This was the second and final regular season meeting between the two teams. The Browns snapped a four-game losing streak tothe Steelers in a 31-10 blowout victory. They also won their first divisional game of the season, ending a five-game losing streak to division foes. The Steelers led 3-0 after the first quarter. However, the Browns scored 21 straight points in the second quarter, building a 21-3 halftime lead. Adding a field goal in the third quarter and a touchdown in the fourth, the Browns created an insurmountable 31-3 lead. The Steelers' late touchdown in the fourth quarter produced the final score. Steelers' QB Ben Roethlisberger suffered only his second career loss in 20 career games against the Browns. For Cleveland, the 21 point margin of victory was the most lopsided win over Pittsburgh since they routed them 51-0 in a Week 1 matchup during the 1989 season. The Browns moved into third place in the AFC North with a 3-2 record while the Steelers fell into fourth place with a 3-3 record.
Output:
How many points did the Browns lead by at the half?