Maths Olympiad
Exam
Q. John lists the integers from 1 to 20 in increasing order. He then erases the first half of the integers in the list and rewrites them in order at the end of the second half of the list. Find the integer in the new list which has exactly 12 integers to its left
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- 3
Earlier position was
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
and new position of numbers is
11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10
so integer in the new list which has exactly 12 integers to its left is 3. - 13 years agoHelpfull: Yes(6) No(2)
- 3 will be the integer in the new list which has exactly 12 integers to its left.
- 13 years agoHelpfull: Yes(4) No(3)
- 3
11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10 - 13 years agoHelpfull: Yes(3) No(5)
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