## Mathematical operation and symbol notation

#### Mathematical operation and symbol notation

Direction: In these question, relationship between different element is shown in the statements. These statements are followed by two conclusions.

1. Statements:
N = P, P < F, F > L, L = k
Conclusions:
I. F = K II. F > K

1. N = P ≤ F ≥ L = K
Hence F ≥ K. Which means either
I (F = K) or II (F > K) follows

##### Correct Option: C

N = P ≤ F ≥ L = K
Hence F ≥ K. Which means either
I (F = K) or II (F > K) follows

1. If + stands for division; x stands for addition; - stands for multiplication, ÷ stands for subtraction, Which of the following is correct ?

1. 25 ÷ 3 x 7 - 8 + 12 = 19.3

##### Correct Option: D

25 ÷ 3 x 7 - 8 + 12 = 19.3

1. After interchanging + and -, 8 and 7, which one of the following becomes correct ?

1. After changing '+' and '-' , 8 and 7 the appropriate equation is,
6 + 8 x 2 - 7 = 0
L.H.S. = 6 - 7 x 2 + 8
6 - 14 + 8
14 - 14 = 0 = R.H.S.

##### Correct Option: C

After changing '+' and '-' , 8 and 7 the appropriate equation is,
6 + 8 x 2 - 7 = 0
L.H.S. = 6 - 7 x 2 + 8
6 - 14 + 8
14 - 14 = 0 = R.H.S.

1. If, + stand for division; x stands for addition; stands for multiplication; ÷ stands for subtraction, which of the following is correct ?

1. After changing '+' = ÷ , '-' = x
'x' = '+' '÷' = -
the equation, 46 - 6 + 4 x 5 ÷ 3 = 71
CHS = 46 x 6 ÷ 4 + 5 - 3
= 276 ÷ 4 + 5 - 3
= 69 + 5 - 3
= 74 - 3 = 71 R.H.S.

##### Correct Option: B

After changing '+' = ÷ , '-' = x
'x' = '+' '÷' = -
the equation, 46 - 6 + 4 x 5 ÷ 3 = 71
CHS = 46 x 6 ÷ 4 + 5 - 3
= 276 ÷ 4 + 5 - 3
= 69 + 5 - 3
= 74 - 3 = 71 R.H.S.

1. Which sequence of mathematical symbols can replace *in the given equation to balance the equation ?
7 * 7 * 2 * 1 = 12

1. Given, 7 * 7 * 2 * 1 = 12
Let us check all the options one by one.

##### Correct Option: B

Given, 7 * 7 * 2 * 1 = 12
Let us check all the options one by one.
From option (a), putting the signs in given equation, we get
7 x 7 - 2 ÷ 1 = 12 ⇒ 7 x 7 - 2 = 12
⇒ 49 - 2 = 12 ⇒ 47 = 12
⇒ LHS ≠ RHS
So, option (a) is incorrect.
From option (b), putting the signs in given equation, we get
7 + 7 - 2 x 1 = 12 ⇒ 7 + 7 - 2 = 12
⇒ 14 - 2 = 12 ⇒ 12 = 12
Hence, option (b) is correct and there is no need to check remaining options .