Question : Directions: Which two signs should be interchanged to make the given equation correct?
63 = 56 + 88 ÷ 11 – 15
Option 1: – and =
Option 2: + and ÷
Option 3: ÷ and –
Option 4: + and =
Correct Answer: – and =
Solution :
Given:
63 = 56 + 88 ÷ 11 – 15
Let's check the options –
First option:
– and =
On interchanging the mathematical signs, we get –
⇒ 63 – 56 + 88 ÷ 11 = 15
L.H.S. = 63 – 56 + 88 ÷ 11 = 63 – 56 + 8 = 15
L.H.S. = R.H.S.
Second option:
+ and ÷
On interchanging the mathematical signs, we get –
⇒ 63 = 56 ÷ 88 + 11 – 15
L.H.S. = 63
R.H.S. = 56 ÷ 88 + 11 – 15 = 0.64 + 11 – 15
L.H.S. ≠ R.H.S.
Third option:
÷ and –
On interchanging the mathematical signs, we get –
⇒ 63 = 56 + 88 – 11 ÷ 15
L.H.S. = 63
R.H.S. = 56 + 88 – 11 ÷ 15
= 56 + 88 – 0.73
= 144 – 0.73
= 143.267
L.H.S. ≠ R.H.S.
Fourth option:
+ and =
On interchanging the mathematical signs, we get –
L.H.S. = 63 + 56 = 119
R.H.S. = 88 ÷ 11 – 15 = 8 – 15 = –7
L.H.S. ≠ R.H.S.
Hence, the first option is correct.
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