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Mathematical Operation

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31 The following equation is incorrect. Which two signs should be interchanged to correct the equation?
1 ÷ 14 x 30 + 20 - 10 = 12

A
- and +
B
÷ and x
C
x and -
D
+ and ÷

32 If Q means 'add to', J means 'multiply by', T means 'substract from' and K means 'divide by' then 30 K 2 Q 3 J 6 T 5 = ? 

A
18
B
28
C
31
D
103

33 If "÷" denotes "multiplied by", "+" denotes "subtracted from", "–" denotes "added to" and "x" denotes "divided by", then which of the following equation is true?

A
16 + 19 x 21 – 5 = 201
B
5 x 6 + 4 ÷ 3 = 37/6
C
6 x 3 + 12 ÷ 3 = 21
D
18 x 6 ÷ 8 – 12 = 36

34 If '+' means subtraction, '÷' means addition, '<' means multiplication and '>' means division, then find the value of the given statement,
The value of 9 ÷ 7 < 8 > (4>2) + 5 will be

A
32
B
18
C
16
D
11

35 In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
72 x 9 - 14 + 2 = ?

A
26
B
80
C
30
D
36

36 If "÷" denotes "multiplied by", "+" denotes "subtracted from", "x" denotes "added to" and "–" denotes "divided by",then 12 – 6 + 28 x 3 ÷ 9 = ?

A
-24
B
-53
C
1
D
0

37 In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
24 x 6 - 8 + 2 = ?

A
25
B
50
C
40
D
20

38 In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
642 x 6 ÷ 25 + 4 = ?

A
11
B
64
C
18
D
7

39 In a certain code language, '-' represents 'x', '÷' represents '+', '+' represents '÷' and 'x' represents '-'. Find out the answer to the following question.19 ÷ 2 - 35 + 10 x 6 = ?

A
20
B
14
C
32
D
16

40 In a certain code language, '-' represents 'x', '÷' represents '+', '+' represents '÷' and 'x' represents '-'. Find out the answer to the following question.19 ÷ 2 - 35 + 10 x 6 = ?

A
20
B
14
C
32
D
16