Given equation: 15324122*5
Option 1) +, ×, –, =, ÷
Mathematical signs to sequentially replace the * signs then:
⇒ 15 + 3 × 24 - 12 = 2 ÷ 5
⇒ 15 + 72 - 12 = 0.4
⇒ 87 - 12 = 0.4
⇒ 75 ≠ 0.4
Option 2) +, –, ×, ÷, =
Mathematical signs to sequentially replace the * signs then:
⇒ 15 + 3 - 24 × 12 ÷ 2 = 5
⇒ 15 + 3 - 24 × 6 = 5
⇒ 15 + 3 - 144 = 5
⇒ 18 - 144 = 5
⇒ -126 ≠ 5
Option 3) +, ×, –, ÷, =
Mathematical signs to sequentially replace the * signs then:
⇒ 15 + 3 × 24 - 12 ÷ 2 = 5
⇒ 15 + 3 × 24 - 6 = 5
⇒ 15 + 72 - 6 = 5
⇒ 87 - 6 = 5
⇒ 81 ≠ 5
Option 4) ÷, +, –, ×, =
Mathematical signs to sequentially replace the * signs then:
⇒ 15 ÷ 3 + 24 - 12 × 2 = 5
⇒ 5 + 24 - 12 × 2 = 5
⇒ 5 + 24 - 24 = 5
⇒ 29 - 24 = 5
⇒ 5 = 5
Hence, the correct answer is "÷, +, –, ×, =".