If the following interchanges are made in signs and numbers, which equation would be correct?
Interchanges:
Signs: ÷ and –
Number: 15 and 5
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e 4 × 30 – 15 ÷ 5 + 12 = 21
| Understanding |
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4 × 30 – 5 ÷ 15 + 14 after interchanging 4 × 30 ÷ 15 – 5 + 14 = 17 |
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4 × 30 – 15 ÷ 5 + 12 after interchanging 4 × 30 ÷ 5 – 15 + 12 = 21 |
| We don't need to check further options. |