 
<translate> Bayan da Greg ya ba ta dala 40, Tessa ta biya shi dala 20. Don haka bashin Tessa ya kasance 40 - 20 = $20. A ƙarshe, ta ce a ba ta ƙarin dala 10, ta bar bashin da ya kai dala 20 + 10 = 30. Amsar ƙarshe: 30. <eng> After Greg lent her $40, Tessa paid him back 40 / 2 = $20. So Tessa's debt was 40 - 20 = $20. Finally, she asked for $10 more, leaving the debt at 20 + 10 = $30. The final answer: 30. 