## Mathematical operation and symbol notation

#### Mathematical operation and symbol notation

1. If '+' means '-', '-', means 'x' , '÷' means '+' and 'x' means '÷', then
10 x 5 ÷ 3 - 2 + 3 = ?

1. ? = 10 x 5 ÷ 3 - 2 + 3
= 10 ÷ 5 + 3 x 2 - 3 (by interchanging sign)

##### Correct Option: A

? = 10 x 5 ÷ 3 - 2 + 3
= 10 ÷ 5 + 3 x 2 - 3 (by interchanging sign)
= 2 + 3 x 2 - 3
= 2 + 6 - 3 = 8 - 3 = 5

1. If Q means '+', J means 'x', T means '-' and K means '÷' then
30 K 2 Q 3 J 6 T 5 = ?

1. Using the correct symbols, we have
30 K 2 Q 3 J 6 T 5
= 30 ÷ 2 + 3 x 6 - 5

##### Correct Option: B

Using the correct symbols, we have
30 K 2 Q 3 J 6 T 5
= 30 ÷ 2 + 3 x 6 - 5
= 15 + 18 - 5 = 33 - 5 = 53

1. If P denotes '÷', Q denotes 'x', R denotes '+' and S denotes '-', then
18 Q 1 2 P 4 R 5 S 6

1. Using the correct symbols, we have
18 Q 1 2 P 4 R 5 S 6
= 18 x 12 ÷ 4 + 5 - 6

##### Correct Option: A

Using the correct symbols, we have
18 Q 1 2 P 4 R 5 S 6
= 18 x 12 ÷ 4 + 5 - 6
= 18 x 3 + 5 - 6
= 54 + 5 - 6 = 59 - 6 = 53

Direction: If the given interchanges are made in signs and numbers, which one of the four equations would be correct?

1. Given interchanges signs '+' and 'x', numbers '3' and '7'

1. (a) 27 x 13 + 37 ≠ 1241
(b) 73 x 37 + 12 ≠ 112
(c) 27 + 13 x 73 ≠ 428
(d) 27 x 13 + 37 = 388

##### Correct Option: D

(a) 27 x 13 + 37 ≠ 1241
(b) 73 x 37 + 12 ≠ 112
(c) 27 + 13 x 73 ≠ 428
(d) 27 x 13 + 37 = 388

1. Given interchanges signs '-' and ' ÷'; numbers '2' and '6'

1. (a) 36 ÷ 16 - 2 ≠ 30
(b) 32 - 16 ÷ 6 ≠ 1
(c) 36 ÷ 12 - 2 = 1
(d) 32 ÷ 16 - 6 ≠ 30

##### Correct Option: C

(a) 36 ÷ 16 - 2 ≠ 30
(b) 32 - 16 ÷ 6 ≠ 1
(c) 36 ÷ 12 - 2 = 1
(d) 32 ÷ 16 - 6 ≠ 30