Which two numbers should be interchanged to make the given equation correct?
7 + 24 × 3 – 72 ÷ 18 = 58
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e 18 and 24
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Given expression: 7 + 24 × 3 – 72 ÷ 18 = 58 Check the options: Option 1: 3 and 7 After replacement the equation becomes; = 3 + 24 × 7 – 72 ÷ 18 = 3 + 24 × 7 –4 = 3 + 168 –4 = 171–4 = 167 Hence, option 1 is not the correct answer. |
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Option 2: 18 and 24 After replacement the equation becomes; = + 18 × 3 – 72 ÷ 24 = 7 + 18 × 3 – 3 = 7 + 54 – 3 = 61– 3 = 58 Hence, option 2 is the correct answer. |
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Option 3: 72 and 24 After replacement the equation becomes; = 7 + 72 × 3 – 24 ÷ 18 = 7 + 72 × 3 – 1.33 = 7 + 216 – 1.33 = 223 – 1.33 = 221.37 Hence, option 3 is not the correct answer. |
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Option 4: 7 and 18 After replacement the equation becomes; = 18 + 24 × 3 – 72 ÷ 7 = 18 + 24 × 3 – 10.285 = 18 + 72 – 10.285 = 90 – 10.285 = 79.715 Hence, option 4 is not the correct answer. |