Add. 15.24+5.09 20.249 21.14 66.14 20.33

To solve the addition problem $15.24 + 5.09$, we need to align the decimal points and add the numbers.<br /><br />$15.24$<br />$+5.09$<br />------<br />$20.33$<br /><br />Therefore, the correct answer is $20.33$.