Q:

By interchanging the given two signs and numbers which of the following equation will be correct?
 + and –, 7 and 3

• 1
  7 + 3 × 9 – 8 ÷ 2 = 30
• 2
  9 × 7 + 3 – 4 ÷ 2 = 18
• 3
  3 × 4 ÷ 2 + 7 – 5 = 16
• 4
  3 + 7 ÷ 1 – 4 × 2 = 16