Question : Directions: Which two signs should be interchanged to make the given equation correct?
108 ÷ 2 × 10 + 70 – 10 = 480
Option 1: + and –
Option 2: ÷ and ×
Option 3: + and ×
Option 4: ÷ and –
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Correct Answer: + and –
Solution :
Given:
108 ÷ 2 × 10 + 70 – 10 = 480
Replace the given symbols in the options one by one with the original symbols in the given equation.
First option:
+ and –
= 108 ÷ 2 × 10 – 70 + 10
= 540 – 70 + 10
= 480
Second option:
÷ and ×
= 108 × 2 ÷ 10 + 70 – 10
= 21.6 + 60
= 81.6 ≠ 480
Third option:
+ and ×
= 108 ÷ 2 + 10 × 70 – 10
= 54 + 700 – 10
= 744 ≠ 480
Fourth option:
÷ and –
= 108 – 2 × 10 + 70 ÷ 10
= 108 – 20 + 7
= 95 ≠ 480
Here, only the first option satisfies the R.H.S. of the given equation. Hence, the first option is correct.
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