Let the number of tie-dyed T-shirts = x
The man sold 4 times as many tie-dyed T-shirts as silk-screened shirts.
So, the number of silk-screened shirts = 4x
He sold 180 shirts altogether
So,

So, the number of tie-dyed shirts = 36
= 16 + 49 - 3(11) - 4(10)
= 16 + 49 - 33 - 40
= -8
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