Question

In a row of 25 children facing south, R is 16th from the right end and B is 18th from the left end. How many children are there between R and B?

• A. 2
• B. 3
• C. 4
• D. Data inadequate
• E. None of these

Answer 1

The correct option is E None of these

We have a total of 25 children and they all are facing south.

We have to find out the number of children between R and B.
R's position from the right is 16th.
So, its position from the left is (25 -16) +19+1 =10th
R is 10th from the left.
B's position from the left is 18th.
So, its position from the right is (25-18) +1
$\Rightarrow 7+1\Rightarrow 8th$
B is 8th from the right.

Number of children between R and B is
25 - (10 + 8) $\Rightarrow$ 25 - 18 = 7
Therefore, there are 7 children between B and R.