Q:

By interchanging the given two signs and numbers which of the following equation will be correct?
 + and –, 2 and 4

• 1
  9 – 5 ÷ 4 × 2 + 8 = 80
• 2
  7 × 4 – 2 ÷ 1 + 5 = 13
• 3
  7 – 8 ÷ 2 + 16 × 4 = 18
• 4
  5 + 7 × 4 – 8 ÷ 2 = 5