math
posted by Shohanur .
during a triathlon, Sharon swims 1/4 of the total route and cycles 3/5 of the remaining route. she runs the rest of the route. if she runs 3,600 meters, find the total distance of the triathlon route. show your work.

answer please

I don't get it

hello

during a triathlon, Sharon swims 1/4 of the total route and cycles 3/5 of the remaining route. she runs the rest of the route. if she runs 3,600 meters, find the total distance of the triathlon route. show your work.

let the total distance be x m
x/4 + 3x/5 + 3600 = x
times 20
5x + 12x + 72000 = 20x
72000 = 3x
x = 24000 m
The triathlon was 24000 m or 24 km 
what do you mean as
5x + 12x + 72000 = 20x
why u need it for? 
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