Final answer:
Abdul sold 19 t-shirts.
Step-by-step explanation:
To find the number of t-shirts Abdul sold, we can set up an equation based on the given information.
Let's assume he sold x t-shirts. The profit from selling t-shirts would be 6x, and the profit from selling hats is given as $54.
The total profit is $168, so we can write the equation as: 6x + 54 = 168.
Solving this equation, we get 6x = 114, and dividing both sides by 6, we find x = 19.
Therefore, Abdul sold 19 t-shirts.