Theorem 8.9 : The line segment joining the mid-points of two sides of a triangle is parallel to the third side.
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We are given
Number of person took cards =3
Average number of cards taken = 11 per person
so, we can find total number of cards
Total number of cards= (average number of cards)*(number of persons)
Total number of cards is
Fernando took 10
so,
Fernando card +other two cards =33
10 +other two cards =33
Other two cards =23..............Answer