Discussion
In a row of girls facing North, Rita is 12th to the left of Parvati, who is 23rd from the right end. If Mamta, who is 17th from the left end, is fourth to the right of Rita, how many girls are there in the row ?
Answer: C
There are 47 girls in the row.
Mamta is 17th from the left and fourth to the right of Rita, so Rita is \(17 - 4 = 13\)th from the left. Parvati is 12 places to the right of Rita, so she is \(13 + 12 = 25\)th from the left.
Parvati is also 23rd from the right, so the total is:
\[ 25 + 23 - 1 = 47 \]
One is subtracted because Parvati is counted in both positions. The other totals come from miscounting one of the positions or forgetting to subtract the shared place.
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