IKMC 2027 - Grades 3-4 - Self-study SET 15 - Thematic Batch 3 Question 4

At the 2012 London Olympics, the USA won 46 gold, 29 silver and 29 bronze medals, while China won 38 gold, 27 silver and 23 bronze medals, according to the figures given here. How many more medals did the USA win?