Question : Directions: Which two numbers, from amongst the given options, should be interchanged to make the given equation correct? 14 + 39 – (√(144) ÷ 4) + (5 × 3) – 6 = 63
Option 1: 14 and 6
Option 2: 5 and 39
Option 3: 4 and 3
Option 4: 4 and 6
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Correct Answer: 4 and 3
Solution : Given: 14 + 39 – (√(144) ÷ 4) + (5 × 3) – 6 = 63
Let's check the options – First option: 14 and 6 On interchanging the given numbers, the equation becomes – ⇒ 6 + 39 – (√(144) ÷ 4) + (5 × 3) – 14 = 63 Solving the L.H.S. of the equation – = 6 + 39 – (12 ÷ 4) + 15 – 14 = 6 + 39 – 3 + 15 – 14 = 60 – 3 – 14 = 43 ≠ 63 Second option: 5 and 39 On interchanging the given numbers, the equation becomes – ⇒ 14 + 5 – (√(144) ÷ 4) + (39 × 3) – 6 = 63 Solving the L.H.S. of the equation – = 14 + 5 – (12 ÷ 4) + 117 – 6 = 14 + 5 – 3 + 117 – 6 = 136 – 3 – 6 = 127 ≠ 63 Third option: 4 and 3 On interchanging the given numbers, the equation becomes – ⇒ 14 + 39 – (√(144) ÷ 3) + (5 × 4) – 6 = 63 Solving the L.H.S. of the equation – = 14 + 39 – (12 ÷ 3) + 20 – 6 = 14 + 39 – 4 + 20 – 6 = 73 – 4 – 6 = 63 Fourth option: 4 and 6 On interchanging the given numbers, the equation becomes – ⇒ 14 + 39 – (√(144) ÷ 6) + (5 × 3) – 4 = 63 Solving the L.H.S. of the equation – = 14 + 39 – (12 ÷ 6) + 15 – 4 = 14 + 39 – 2 + 15 – 4 = 68 – 2 – 4 = 62 ≠ 63
So, only the equation in the third option satisfies the R.H.S. of the given equation. Hence the third option is correct.
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