Question : Directions: Which two numbers should be interchanged, to make the given equation correct? 120 ÷ 12 × 6 + 24 – 15 = 27
Option 1: 12 and 6
Option 2: 12 and 15
Option 3: 12 and 24
Option 4: 6 and 24
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Correct Answer: 12 and 24
Solution : Given: 120 ÷ 12 × 6 + 24 – 15 = 27
Replace the given numbers according to the options one by one with the original numbers in the given equation. First option: 12 and 6 120 ÷ 12 × 6 + 24 – 15 = 27 = 120 ÷ 6 × 12 + 24 – 15 = 240 + 9 = 249 ≠ 27 Second option: 12 and 15 120 ÷ 12 × 6 + 24 – 15 = 27 = 120 ÷ 15 × 6 + 24 – 12 = 48 + 12 = 60 ≠ 27 Third option: 12 and 24 120 ÷ 12 × 6 + 24 – 15 = 27 = 120 ÷ 24 × 6 + 12 – 15 = 30 – 3 = 27 Fourth option: 6 and 24 120 ÷ 12 × 6 + 24 – 15 = 27 = 120 ÷ 12 × 24 + 6 – 15 = 240 – 9 = 231 ≠ 27
Here, only the third option satisfies the R.H.S. of the given equation. Hence, the third option is correct.
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Question : Directions: Which two numbers should be interchanged to make the given equation correct? 144 ÷ 24 × 6 + 12 – 18 = 78
Option 1: 6 and 18
Option 2: 24 and 12
Option 3: 24 and 6
Option 4: 24 and 18
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Option 1: ÷ and ×
Option 2: ÷ and +
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Option 1: + and =
Option 2: + and –
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Option 1: × and ÷
Option 2: + and ÷
Option 3: + and ×
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Option 1: + and ÷
Option 2: × and =
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