Correct option is D
Given,
72 × 6 + 18 ÷ 5 - 9 = 93
If interchange option A: × and +
New equation: 72 + 6 × 18 ÷ 5 - 9
72 + (6 × 18) ÷ 5 - 9
= 72 + 108 ÷ 5 - 9
= 72 + 21.6 - 9
= 93.6 (Incorrect)
If interchange option B: + and -
New equation: 72 × 6 - 18 ÷ 5 + 9
(72 × 6) - (18 ÷ 5) + 9
= 432 - 3.6 + 9
= 437.4 (Incorrect)
If interchange option C: ÷ and -
New equation: 72 × 6 + 18 - 5 ÷ 9
(72 × 6) + 18 - (5 ÷ 9)
= 432 + 18 - 0.56
= 449.44 (Incorrect)
If interchange option D: × and ÷
New equation: 72 ÷ 6 + 18 × 5 - 9
(72 ÷ 6) + (18 × 5) - 9
= 12 + 90 - 9
= 93(Correct)
Thus, the correct answer is D. × and ÷
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