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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
This problem is poorly phrased. It should state MORE clearly that they take time to fix the rope and RESUME counting the jumps from the number they messed up on, because right now it sounds as though [10,20,30] means the child jumps 10 jumps, messes up, then jumps 20 more jumps the second time, messes up, then jumps 30 times the third time.
confusion from your current phrasing:: The 1st mistake occurred when he jumped 12 times; The 2nd mistake occurred when he jumped 23 times; The 3rd mistake occurred when he jumped 45 times.