Question

Mehrunnisa is eleventh from either end of a row of girls How many girls are there in that row?

• A. 19
• B. 20
• C. 21
• D. 23

Answer 1

Answer: (C)

21

Mehrunnisa is 11th from either end in a row of girls.
So, we place Mehrunnisa in the centre.
□Mehrunnisa◻Mehrunnisa
Fill in people first from left and from right, so that Mehrunnisa comes 11th from both the ends.
∙∙∙∙∙∙∙∙∙∙□∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙◻∙∙∙∙∙∙∙∙∙∙
M
So totally there are 21 girls in the row. Another approach is to mentally think in the following manner.
Since Mehrunnisa is 11th from left. Hence there must be 10 people to Mehrunnisa's left so also for Mehrunnisa's right so there are 10 girls to the left of Mehrunnisa and 10 to her right! Hence, total number of girls in the rwo = 10 + 1 (Counting Mehrunnisa too) + 10 = 21