Z5–I–4 MO 2017 Badminton
Eve 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 Eve and Mark finished the game, Viktor had drawn the following:
OOOXXXXXXXX
Determine the least and greatest number of rallies Eve and Mark could have played.
OOOXXXXXXXX
Determine the least and greatest number of rallies Eve and Mark could have played.
Final Answer:
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algebrabasic operations and conceptsGrade of the word problem
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