In a column of thirty boys,M is eighth from the end and J is twelfth from the front. If there are six boys between J and Q, how many boys are there between M and Q ?
The formula to be used is total number of boys = boys ahead of the person on the front + boys behind the person on the back + boys in between the two.
The question doesn't clarify if J is ahead of Q or behind. So, there are two possible answers to this question. So, we can choose (d) data inadequate.
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