Mathematical operation and symbol notation
Direction: Correct the following equations by interchanging the two signs.
 15 ÷ 9 x 3  74 + 2 = 5

 + and 
 ÷ and x
 + and ÷
  and ÷
 None of the these

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Correct Option: C
If we interchanges signs '+' and '÷', then the equation changes into
15 + 9 x 3  74 ÷ 2 = 15 + 27  37 = 5
 51 ÷ 3 x 12  6 + 3 = 201

 + and ÷
  and +
 x and ÷
  and x
 None of these

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Correct Option: E
None of the interchange is applicable in the equation to produce number 201
 16 + 4 ÷ 2  21 x 7 = 21

 + and 
 + and x
  and ÷
 x and ÷
 None of these

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Correct Option: D
If we interchange the signs 'x' and '÷' the equation becomes
16 + 4 x 2  21 ÷ 7 = 16 + 8  3 = 21
 3^{2} x 2 ^{2} ÷ (6^{2}  9) + 1^{2} = 33

  and ÷
 + and x
 x and ÷
 + and 

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Lets try all options one by one.
Correct Option: A
If we interchange symbols '' and '÷', the equation becomes
9 x 4  (36 ÷ 9) + 1
= 9 x 4  36/9 + 1
= 36  4 + 1
= 33
Direction: In the following questions, which one of the four interchanges in signs and numbers would make the given equation correct?
 4 x 6  2 = 14

 x to ÷, 2 and 4
  to +, 2 and 6
 x to +, 4 and 8
  to ÷, 2 and 6

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Interchange '' to '+' and 2 to 6 and try
Correct Option: B
On interchanging '' to '+' and 2 to 6
4 x 2 + 6 = 14
⇒ 8 + 6 = 14
⇒ 14 = 14