Total number of cards in the stack =180
Height of stack (all cards) = 38 inches
Now, we know that the thickness of 180 cards is 38 inches,
now the thickness of one card can be obtained by dividing the total thickness by the number of cards
Thickness of 1 card = Total thickness of all cards/ total number of cards
Thickness of 1 card = 38 inches/180 = 0.211111.....inches
Each card is 0.21 inch thick (rounded to two decimals)
