Mathematical Operation (SSC REASONING) Part-4

Total Questions: 50

41. What will come in the place of the question mark (?) in the following equation, if '+' and '-' are interchanged and 'x' and '÷' are interchanged?

87÷3+35-88 x 11 = ?

Correct Answer: (a) 234
Solution:Given:- 87 ÷3 + 35-88 x 11
As per given instruction after
interchanging '+' with'and 'x' with '÷'
we get
87 x3-35+88 ÷ 11
261-35+ 8 = 234

42. 13*7*12*4* 15*65

Correct Answer: (a) +, +, ÷, x, =
Solution:After going through all the
options, option (a) satisfied.
13+7+12÷ 4 x 15 = 65
20 +3 x 15 ⇒ 20 +45 = 65

43. What will come in place of the question mark (?) in the following equation if '+' and 'x' are interchanged and '-' and '÷' are interchanged?

14-7 x 10÷1+7 = ?

Correct Answer: (d) 5
Solution:Given :- 14-7 × 10 ÷1+7
As per given instruction after
interchanging '+' with 'x' and '-'with '÷'
we get'
=14÷7+10-1×7 = 2 +10-7 = 5

44. 10*2*1* 8* 11 * 8

Correct Answer: (a) ÷,-,x, +, =
Solution:After going through all the
options, option (a) satisfies.
10÷2-1x8+11 = 8
5-8+11 ⇒16-8=88=8
L.H.S. = R.H.S.

45. Which two signs should be interchanged to make the given equation correct ?

10÷ 63 x 7+ 90-80 = 100

Correct Answer: (b) x and -
Solution:Given :-
10 ÷ 63 x 7+90- 80 = 100
After going through all the options,
option b satisfied. After interchanging x
and ÷ we get,
10 x 63÷7+90-80
10 x9+10
90+10 = 100 ⇒ 100 = 100
L.H.S. = R.H.S.

46. If + means -, - means x, x means ÷, ÷ means +, what will come in place of the question mark (?) in the given equation?

22 x 11 -450 ÷ 50 + 500 = ?

Correct Answer: (d) 450
Solution:Given :-
22 x 11-450÷50 + 500
As per given instruction after
interchanging the sign we get
22÷11 × 450 + 50-500
2 x 450 -450 ⇒ 900 - 450 = 450

47. Select the correct combination of mathematical signs to sequentially place from left to right in the blanks below to balance the given equation.

6_2_0_8= 20

Correct Answer: (c) x, +,+
Solution:After going through all the
options, option (c) satisfied.
6×2+0+ 8 = 20
12+8 = 20 ⇒ 20 = 20
L.H.S. = R.H.S.

48. Which two signs should be interchanged to make the given equation correct?

5+156-12 × 15÷15=185

Correct Answer: (d) ÷ and -
Solution:Given :-
5+156-12 x 15 ÷15 = 185
After going through all the options,
option d satisfied. After interchanging÷
and - we get,
5+156 ÷ 12 × 15-15
5+13 x 15-15
5+195-15 ⇒ 5+ 180 = 185
L.H.S. = R.H.S.

49. What will come in place of the question mark (?) when + and - are interchanged and 5 and 18 are also interchanged?

5-18+ 12 = ?

Correct Answer: (b) 11
Solution:Given :- 5-18+ 12
As per given iństruction after
interchanging '+' and'-'and '5' and '18'
we get
18+5-12 ⇒ 23-12=11

50. If + means x, - means ÷, x means -, and ÷ means +, what will be the value of the following expression?

9+7x 15-5÷5 = ?

Correct Answer: (b) 65
Solution:Given :- 9+7 x 15-5÷5
As per given instruction after
interchanging the signs we get,
9 x 7-15÷5+5
63-3+5 ⇒ 63+2= 65