In a row of some children facing north Raju sits 15th from the left and Damu sits 9th from the left ...........

Logical Reasoning(Master ) Ranking and ordering

In a row of some children facing north, Raju sits 15th from the left and Damu sits 9th from the left. Ramu who sits exactly between Raju and Damu, is 10th from the right. then how many children are there in the row?

None of these

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Explanation:

Raju sits 15th from the left and Damu sits 9th from the left.
Order of persons in the row = 8 persons + Damu + 5 persons + Raju
Also, Ramu who sits exactly between Raju and Damu, is 10th from the right.
Order of persons in the row = 8 persons + Damu + 2 persons + Ramu + 2 persons + Raju + 6 persons
Total persons in the row = 8 persons + 1 + 2 persons + 1 + 2 persons + 1 + 6 persons
∴ Total persons in the row = 21 persons