Answer: Pat could bought atleast 3 pounds of pears.
Explanation:
Let the price of one pound of apple be $1
So, the price of one pound of pear would be $1 + $0.50 = $1.50
Let the number of pounds of pears be 'x'.
So, for same amount of money the equation would be

(1) atleast 3 pounds of pears he could bought.
For second case,
Cost of one pound of pear would be

So, equation becomes,

So, (2) atleast 3 pounds of pears he could buy.
Hence, Pat could bought atleast 3 pounds of pears.