If × stands for subtraction, ÷ stands for addition, + stands for division, and - stands for multiplication, which of the following equations is correct?
1
45 - 15 ÷ 15 × 60 + 16 = 42
2
25 + 5 × 20 ÷ 5 - 16 = 6
3
9 ÷ 28 - 10 × 15 + 9 = 10
4
16 ÷ 20 - 6 + 10 × 12 = 16