Paul has 52 marbles. His friend gave him 28 marbles. Then, he lost 1/4 of his marbles. How many marbles does Paul have left?
Paul has a total of 52 + 28 = 
<gadget id="calculator">52+28</gadget>
<output>80</output>
80 marbles.
He lost 1/4 x 80 = 
<gadget id="calculator">80/4</gadget>
<output>20</output>
20 marbles.
Therefore, he has 80 - 20 = 
<gadget id="calculator">80-20</gadget>
<output>60</output>
60 marbles left.

<result>60</result>