The correct option is D 13
No.of pants = 39
No.of Shirts = 66
Given that they should be packed in equal no.of bags
we need to find the common factors of 36, 66 to find that
Factors of 39 = 1, 3, 13, 39
Factors of 66 = 1, 2, 3, 11, 22, 33, 66
Common factor = 3
So there will be 3 bags of each,
Number of pants in each bag = 39
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÷ 3 = 13