If I'm not wrong, there are 19 '2's' in each hundred and 19x4=76 I think there are 76 2's....
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600 metres.
There are infinitely many possible answers. 40*1 40*1*1 40*1*1*1 and so on. 400*0.1 400*0.1*1 400*0.1*1*1 etc and then 4000*0.1*0.1 4000*0.1*0.1*1 or 4000*0.01 etc And then there are irrationals 20*sqrt(2)*sqrt(2)
Exactly 400 times
160% of 400 = 160/100 x 400/1 = 160/1 x 4/1 = 640
2 1/2 laps around a track is one kilometer. Each lap is 400 meters.