Can someone help me out, I’m a bit stumped with this problem :(

Match each equation with the operation you can use to solve for the variable. subtract 10. divide by 10. divide by 5. subtract 18. multiply by 10. add 18. add 10. multiply by 5. 5 = 10p arrowright p + 10 = 18 arrowright p + 18 = 5 arrowright 5p = 10 arrowright

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²

Which one is the correct answer, and why?