How do you solve these three problems?

Question

The directions say to add parentheses to make a true statement. It may be PEMDAS (order of operations). Here they are: nine plus twelve divided by three minus one equals fifteen, four plus three times five minus two equals twenty-one, and eight plus five squared minus six divided by three equals nine. Thank you!

Answer 1

i)  9+12/3-1=15

ans: 9+ {12 /(3-1)} =15

ii) 4+ 3 (5-2) = 21

ans: (4 + 3) (5 - 2) = 21

iii) 8+ 5^2 - 6/3 = 9

ans: i think there is a error in the question.