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Q: Which two numbers should be interchanged to make the given equation correct? (99 − 42 + 11) + (36 ÷ 6) × 7 − 50 = 73 (NOTE: Numbers must be interchanged and not the constituent digits e.g. if 2 and 3 are to be interchanged in the equation 43 × 3 + 4 ÷ 2, then interchanged equation is 43 × 2 + 4 ÷ 3)
  • A. 7 and 11
  • B. 50 and 99
  • C. 50 and 11
  • D. 42 and 36
Correct Answer: Option D - According to the given question from option (d), (99 − 42 + 11) + (36 ÷ 6) × 7 − 50 = 73 By interchanging 36 and 42, (99 - 36 + 11) + (42 ÷ 6)  7 - 50 = 75 74 + 49 - 50 = 73 73 = 73 Hence option (d) is correct answer.
D. According to the given question from option (d), (99 − 42 + 11) + (36 ÷ 6) × 7 − 50 = 73 By interchanging 36 and 42, (99 - 36 + 11) + (42 ÷ 6)  7 - 50 = 75 74 + 49 - 50 = 73 73 = 73 Hence option (d) is correct answer.

Explanations:

According to the given question from option (d), (99 − 42 + 11) + (36 ÷ 6) × 7 − 50 = 73 By interchanging 36 and 42, (99 - 36 + 11) + (42 ÷ 6)  7 - 50 = 75 74 + 49 - 50 = 73 73 = 73 Hence option (d) is correct answer.