Capgemini Company Numerical Ability Number System

A is fourteenth from the left end and B is tenth from the right end. If there are 3 boys between them and B is to the left of A then the total number of a students in the row.
A)21 B)27 C)22 D)26 E)None of these

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Capgemini Other Question
In the worst case, the number of comparisons needed to search a singly linked list of length n for a given element is
a) log 2 n b) n/2 c) log 2 n 1 d) n Smallest side of a right-angled triangle is 13 cm less than the side of a square of perimeter 72 cm. Second largest side of the right-angled triangle is 2 cm less than the length of the rectangle of area 112 cm² and breadth 8 cm. What is the largest side of the right-angled triangle?
A)20 cm B)12 cm C)10 cm D)13 cm