Z5–I–4 MO 2017 Badminton
Eva and Mark were playing badminton and Viktor counted their rallies. After every 10 rallies, Viktor drew a cross (X). Then, instead of every 10 crosses, he drew a circle (O) and erased the corresponding 10 crosses. When Eva and Mark finished the game, Viktor had drawn the following:
OOOXXXXXXXX
Determine the least and most rallies Eva and Mark played.
OOOXXXXXXXX
Determine the least and most rallies Eva and Mark played.
Correct answer:
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algebrabasic operations and conceptsGrade of the word problem
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