In the first round of slalom fell 15% of all competitors and in the second round another 10 racers. Together, 40% of all competitors fell. What was the total number of competitors?

Correct result:

n =  40


0.15n + 10 = 0.40n

0.15•n + 10 = 0.40•n

0.25n = 10

n = 40

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