In a row of girls, Rita and Monika occupy the | vedclass

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(B) Initially, Rita is $9^{th}$ from the right and Monika is $10^{th}$ from the left.After interchanging, Rita takes Monika's original position ($10^{

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$26$

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(B) Initially, Rita is $9^{th}$ from the right and Monika is $10^{th}$ from the left.After interchanging, Rita takes Monika's original position ($10^{th}$ from the left) and Monika takes Rita's original position ($9^{th}$ from the right).We are given that after interchanging, Monika is $18^{th}$ from the left.Since Monika is now at the position originally held by Rita (which was $9^{th}$ from the right), we know that Monika's new position is $18^{th}$ from the left and $9^{th}$ from the right.Total number of girls $= (	ext{Position from left} + 	ext{Position from right}) - 1$.Total $= (18 + 9) - 1 = 27 - 1 = 26$.

In a row of girls, Rita and Monika occupy the ninth place from the right end and tenth place from the left end, respectively. If they interchange their places, then Rita and Monika occupy the eighteenth place from the left end. How many girls are there in the row?

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