Answer:

[(15 __ 5 ) __ 3 - 20] __ 8 = 5​

[(15 + 5 ) x 3 - 20] ÷ 8 = 5​

CHeCKING:

[(15 + 5 ) x 3 - 20] ÷ 8 = 5​

[( 20 x 3 - 20] ÷ 8 = 5

[60 - 20] ÷ 8 = 5

40 ÷ 8 = 5

5 = 5 (CORRECT