100
2...99 and 100...98 and 101 are not counted
between 60 to 100 times a minute
20 times
ten times
300 times. In the ones place it occurs ten times per each 100 [5,15,25,...95] so 10x10 =100. Then in the tens place it also occurs ten times each 100 [50,51,52,53...59] We already counted 55 as one for the ones place and now we're counting 1 for the tens place. In the hundreds place, from 500 to 599 there are 100 fives (we already counted the tens and ones places. So 100 + 100 + 100 = 300.
20
20
20
55
Between 10 to 100 times the radius
73
19.