Sixteen children stand in a row facing north. Mona is 5th from the left end. Reena is 3rd to the left of the child who is 10th from the right end. How many children stand between Mona and Reena?

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CorrectNot quiteAnswer A

Correct answer: A

The child 10th from the right is $16 - 10 + 1 = 7$ th from the left.
Reena is 3 places to the left of that child: $7 - 3 = 4$ th from the left.
Mona is 5th and Reena 4th, so they stand side by side, with 0 children between them.

Worth noting

Convert every position to the same end before comparing. 2 comes from placing Reena 3rd to the RIGHT of the 7th child.

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