Question : Directions: Which two numbers, from amongst the given options, should be interchanged to make the given equation correct? (6)³ ÷ 12 + [(√81) x 4] – (28 ÷ 2) + 24 = 43
Option 1: 12 and 24
Option 2: 6 and 24
Option 3: 81 and 4
Option 4: 28 and 24
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Correct Answer: 12 and 24
Solution : Given: (6)³ ÷ 12 + [(√81) x 4] – (28 ÷ 2) + 24 = 43
Interchanging the numbers as given in the options – First option: 12 and 24 (6)³ ÷ 24 + [(√81) x 4] – (28 ÷ 2) + 12 = 43 ⇒ 216 ÷ 24 + (9 x 4) – 14 + 12 = 43 ⇒ 216 ÷ 24 + 36 – 14 + 12 = 43 ⇒ 9 + 36 – 14 + 12 = 43 ⇒ 57 – 14 = 43 = R.H.S Second option: 6 and 24 (24)³ ÷ 12 + [(√81) x 4] – (28 ÷ 2) + 6 = 43 ⇒ 13824 ÷ 12 + (9 x 4) – 14 + 6 = 43 ⇒ 13824 ÷ 12 + 36 – 14 + 6 = 43 ⇒ 1152 + 36 – 14 + 6 = 43 ⇒ 1152 + 36 – 14 + 6 = 43 ⇒ 1194 – 14 = 1180 ≠ 43 Third option: 81 and 4 (6)³ ÷ 12 + [(√4) x 81] – (28 ÷ 2) + 24 = 43 ⇒ 216 ÷ 12 + (2 x 81) – 14 + 24 = 43 ⇒ 216 ÷ 12 + 162 – 14 + 24 = 43 ⇒ 18 + 162 – 14 + 24 = 43 ⇒ 204 – 14 = 43 = 190 ≠ 43 Fourth option: 28 and 24 (6)³ ÷ 12 + [(√81) x 4] – (24 ÷ 2) + 28 = 43 ⇒ 216 ÷ 12 + (9 x 4) – 12 + 28 = 43 ⇒ 216 ÷ 12 + 36 – 12 + 28 = 43 ⇒ 18 + 36 – 12 + 28 = 43 ⇒ 82 – 12 = 70 ≠ 43
So, only the first option satisfies the R.H.S. of the given equation. Hence, the first option is correct.
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