Mathematical operation and symbol notation
 Which one of the four interchange in signs or numbers would make the given equation correct ?
6 x 4 + 2 = 16

 + and x, and 4
 + and x, 2 and 4
 + and x, 4 and 6
 None of these

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Apply all option one by one.
Correct Option: C
Apply all option one by one.
∵ 6 x 4 + 2 = 16 ⇒ 4 + 6 x 2 = 16 ⇒ 4 + 12 = 16
 Select the correct combination of mathematical sign to replace * signs and to balance the given equation.
15 * 24 * 3 * 6 * 17

 + ÷  =
 + x = ÷
  x = +
  ÷ + =

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Given equation → 15 * 24 * 3 * 6 * 17
Substitute the signs from given optionsCorrect Option: A
Given equation → 15 * 24 * 3 * 6 * 17
From option (a), substitute the signs
15 + 24 ÷ 3  6 = 17
⇒ 15 + 24/3  6 = 17
⇒ 15 + 8  6 = 17
⇒ 23  6 = 17
∴ 17 = 17
 If 2^{3} ÷ 4 = 2, 4^{4} ÷ 8 = 32, then what will be the value of 6^{2} ÷ 4?

 9
 10
 8
 12

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(2)^{3} ÷ 4 = 2, (4)^{4} ÷ 8 = 32
Therefore, (6)^{2} ÷ 4 = 9Correct Option: A
(2)^{3} ÷ 4 = 2, (4)^{4} ÷ 8 = 32
Therefore, (6)^{2} ÷ 4 = 9
 If 2 & 6 % 7 = 33, 4 & 6 % 8 = 54, then what will be the value of 6 % 8 & 9?

 95
 77
 99
 None of these

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Here sign '&' does not convey any meaning and sign '%' signifies '+'
26 + 7 = 33, 46 + 8 = 54
Therefore, 6 + 89 = 95Correct Option: A
Here sign '&' does not convey any meaning and sign '%' signifies '+'
26 + 7 = 33, 46 + 8 = 54
Therefore, 6 + 89 = 95
 If 879 = 9, 625 = 1 and 586 = 9, then 785 = ?

 6
 7
 8
 9

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879 ⇒ (7 + 9)  8 = 8
625 ⇒ (2 + 5)  6 = 1
and 586 ⇒ (8 + 6)  5 = 9
Similarly, 785 ⇒ (8 + 5)  7 = 6Correct Option: A
879 ⇒ (7 + 9)  8 = 8
625 ⇒ (2 + 5)  6 = 1
and 586 ⇒ (8 + 6)  5 = 9
Similarly, 785 ⇒ (8 + 5)  7 = 6