Question : Directions: If A denotes +, B denotes ×, C denotes –, and D denotes ÷, then what will come in place of (?) in the following equation? 7 A 3 B 24 D 2 = 20 B ? A 3
Option 1: 2
Option 2: 20
Option 3: 14
Option 4: 7
Correct Answer: 2
Solution : Given: 7 A 3 B 24 D 2 = 20 B ? A 3
Let the missing number be a. After replacing the letters with the mathematical signs, we get – ⇒ 7 + 3 × 24 ÷ 2 = 20 × a + 3 ⇒ 7 + 3 × 12 = 20 × a + 3 ⇒ 7 + 36 = 20 × a + 3 ⇒ 43 = 20 × a + 3 ⇒ 43 – 3 = 20 × a ⇒ 40 = 20 × a ⇒ a = 2
So, 2 is the answer to the given equation. Hence, the first option is correct.
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