Question : Directions: If + is interchanged with ×, and – is interchanged with ÷, then which of the following equations is correct?

Option 1: 18 + 6 × 24 – 4 ÷ 64 = 50

Option 2: 18 + 6 ÷ 24 – 4 × 64 = 50

Option 3: 18 – 6 × 24 + 4 ÷ 64 = 50

Option 4: 18 ÷ 6 + 24 – 4 × 64 = 50

Question : The least common multiple of 12, 18, and 27 is:

Option 1: 54

Option 2: 216

Option 3: 27

Option 4: 108

Question : The highest common factor of 108, 72, and 5$a$ is $a$. What can be the least common multiple of 108, 72, and $a$?

Option 1: 432

Option 2: 324

Option 3: 108

Option 4: 216

Question : Directions: Which two numbers (not digits) should be interchanged to make the given equation correct?
(18 × 2) – 24 + 10 × 160 ÷ 16 + (10 × 4) = 170

Option 1: 2 and 24

Option 2: 2 and 4

Option 3: 24 and 18

Option 4: 16 and 18

Question : The highest common factor of 120, 360, and 210 is:

Option 1: 12

Option 2: 30

Option 3: 3

Option 4: 15