Mathematical operation and symbol notation
 If '+' means 'minus', '' means 'multiply', '÷' means 'plus' and 'x' means 'divide', then 10 x 5 ÷ 3  2 + 3 = ?

 5
 53/3
 21
 36

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? = 10 x 5 ÷ 3  2 + 3
As per question
= 10 ÷ 5 + 3 x 2  3
Apply the rule BODMAS
B Brackets first
O Orders (i.e. Powers and Square Roots, etc.)
DM Division and Multiplication (lefttoright)
AS Addition and Subtraction (lefttoright)Correct Option: A
? = 10 x 5 ÷ 3  2 + 3
= 10 ÷ 5 + 3 x 2  3
Apply the rule BODMAS
Do things in Brackets First
(Powers, Roots) before Multiply, Divide, Add or Subtract.
Multiply or Divide before you Add or Subtract
= 10 ÷ 5 + 3 x 2  3
= 2 + 3 x 2  3
Addition
= 2 + 6  3
Subtraction
= 8  3 = 5
 If "T" means (x), 'U' means () , 'X' means (÷) and W means (+), then what will be the value of the following expression ?
(50 X 2) W (28 T 4 )

 142
 158
 137
 163

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Given expression, (50 x 2) W (28 T 4)
After interchanging the letters with symbols, we get
(50 ÷ 2) + (28 x 4)Correct Option: C
Given expression, (50 x 2) W (28 T 4)
After interchanging the letters with symbols, we get
(50 ÷ 2) + (28 x 4) = 25 + 112 = 137
 Select the correct combination of mathematical signs to replace the * signs and to balance the given equation.
40 * 2 * 4 * 3 * 8

 +  ÷ =
 ÷ + = x
 + ÷ x =
 + x  =

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Given, 40* 2* 4 * 3 * 8
Let us check all the options one by one.
From option (a), putting the signs in given equation, we get
40 + 2  4 ÷ 3
= 8 ⇒ 42  4/3 = 8
⇒ 126  4 = 24 ⇒ 122 = 24
∴ L H S ≠ R H S
So, option (a) is incorrect.
From option (b), putting the signs in given equation, we get
40 ÷ 2 + 4 = 3 x 8
⇒ 20 + 4 = 24 ⇒ 24 = 24Correct Option: B
Given, 40* 2* 4 * 3 * 8
Let us check all the options one by one.
From option (a), putting the signs in given equation, we get
40 + 2  4 ÷ 3
= 8 ⇒ 42  4/3 = 8
⇒ 126  4 = 24 ⇒ 122 = 24
∴ L H S ≠ R H S
So, option (a) is incorrect.
From option (b), putting the signs in given equation, we get
40 ÷ 2 + 4 = 3 x 8
⇒ 20 + 4 = 24 ⇒ 24 = 24
LHS = RHS
Hence, option (b) is correct and there is no need to check remaining options.
Direction: In each of the following questions, all the equations except one have been solved according to a certain rule. You are required to solve the unsolved equation following the same rule and to choose the correct answer out of the given options.
 4  4 = 17, 6  6 = 37, 2  2 = 5, 5  5 = ?

 27
 26
 20
 24

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As, 4  4 ⇒ 4 x 4 + 1 = 17
6  6 ⇒ 6 x 6 + 1 = 37Correct Option: B
As, 4  4 ⇒ 4 x 4 + 1 = 17
6  6 ⇒ 6 x 6 + 1 = 37
2  2 ⇒ 2 x 2 + 1 = 5
Similarly, 5  5 ⇒ 5 x 5 + 1 = 26
∴ ? = 26
 If S means '', Q means 'x' , R means '÷' and P means '+' then
1 P 45 R 2 Q 2 S 4 = ?

 40
 42
 36
 46
 38

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After replacing the sign according to question
1 P 45 R 2 Q 2 S 4
= 1 + 45 ÷ 2 x 2  4Correct Option: B
After replacing the sign according to question
1 P 45 R 2 Q 2 S 4
Apply the BODMAS Rule
= 1 + 45 ÷ 2 x 2  4
= 1 + 22.5 x 2  4
= 1 + 45  4 = 42