<human>:  On Tuesday last week, Leo dropped off 10 pairs of trousers and some shirts at Sudsy Laundry. He was given a bill of $140, charged at $5 per shirt and $9 for each pair of trousers. When he went to pick up his clothes yesterday, the attendant insisted that he had only dropped off 2 shirts. Leo reported the matter to the manager, who ordered the attendant to search for the rest of Leo’s shirts. How many shirts were missing?
<bot>: How much did Leo pay for all of his trousers? ** The cost of laundering all of Leo’s trousers is 10 * 9 = <<10*9=90>>90 dollars
How much did Leo pay for all of his shirts? ** Since the total bill was 140 dollars, this means that all the shirts were cleaned for 140 - 90 = <<140-90=50>>50 dollars.
How many shirts were laundered? ** As each shirt is cleaned at 5 dollars, Sudsy Laundry therefore laundered a total of 50/5 = <<50/5=10>>10 shirts
How many shirts were missing? ** The missing shirts are therefore 10 - 2 = <<10-2=8>>8 shirts
#### 8