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Some equations have been solved on the basis of a certain system. Find the correct answer for the unsolved equation on that basis.

If 45 × 72 = 9, 40 × 51 = 7, then 12 × 40 = ?

  1. 4
  2. 6
  3. 8
  4. 2

Answer (Detailed Solution Below)

Option 1 : 4
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Detailed Solution

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The pattern followed is:

Sum of first two numbers is divided by 13.

45 + 72 = 117, 117 ÷ 13 = 9

40 + 51 = 91, 91 ÷ 13 = 7

Similarly,

12 + 40 = 52, 52 ÷ 13 = 4

Therefore, ‘4’ is the correct answer.
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