Question : Directions: Which of the following interchange of signs would make the given equation correct?
28 – 7 + 2 × 2 = 0
Option 1: Change + into ×
Option 2: Change × into +
Option 3: Change – into +
Option 4: Change + into –
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Correct Answer: Change + into ×
Solution :
Given:
28 – 7 + 2 × 2 = 0
Replace the given symbols in the options one by one with the original symbols in the given equation.
First option:
Change + into ×
=
28 – 7 × 2 × 2
=
28 – 28
= 0
Second option:
Change × into +
=
28 – 7 + 2 + 2
=
28 – 7 + 4
=
28 – 3
25 ≠ 0
Third option:
Change – into +
=
28 + 7 + 2 × 2
=
28 + 7 + 4
=
28 + 11
39 ≠ 0
Fourth option:
Change + into –
=
28 – 7 – 2 × 2
=
28 – 7 – 4
=
28 – 11
17 ≠ 0
Here, only the first option satisfies the R.H.S. of the given equation. Hence, the first option is correct.
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