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Option 2 : × and + , 4 and 5
Option 1: (+ and - , 120 and 11)
= (120 – 5 + 11 ÷ 4) × 20
= (115 + 2.75) × 20
= 117.75 × 20
= 2355 ≠ 40
Option 2: (× and +, 4 and 5)
= (11 × 4 – 120 ÷ 5) + 20
= (44 – 24) + 20
= 20 + 20
= 40
Option 3: (÷ and ×, 11 and 5)
= (5 + 11 – 120 × 4) ÷ 20
= (55 – 480) ÷ 20
= -425 ÷ 20
= 21.25 ≠ 40
Option 4: (+ and ÷, 4 and 11)
= (4 ÷ 5 – 120 + 11) × 20
= (0.8 – 109) × 20
= - 108.2 × 20
= 2164 ≠ 40
Hence the answer is × and + , 4 and 5
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