First, substract the total of points with the points he got from signing up, to find the points he got after playing points after playing = 500 - 200 points after playing = 300
Second, divide the points after playing by the number of points per hour, to find how long Ming played time = 300/20 time = 15
Step-by-step explanation: A flat surface made up of points that extends infinitely in all directions. There is exactly one plane through any three points that are not on the same line. Two dimensions with length (infinite) and width (infinite).