Question : Directions: Select the option that is related to the fourth term in the same way as the first term is related to the second term and the fifth term is related to the sixth term. 10 : 45 :: ? : 28 :: 11 : 55
Option 1: 9
Option 2: 8
Option 3: 12
Option 4: 10
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Correct Answer: 8
Solution : Given: 10 : 45 :: ? : 28 :: 11 : 55
Like, 10 : 45→(10 ÷ 2) × (10 – 1) = 5 × 9 = 45 And, 11 : 55→(11 ÷ 2) × (11 – 1) = 5.5 × 10 = 55 Similarly, for (? : 28)→(X ÷ 2) × (X – 1) = 28 ⇒ (X) × (X – 1) = 28 × 2 ⇒ (X) × (X – 1) = 56 ⇒ X 2 – X – 56 = 0 ⇒ (X – 8)(X + 7) = 0 ⇒ X = either 8 or –7. As value can not be negative. So, X = 8.
So, 8 is related to 28. Hence, the second option is correct.
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