Mathematical Operation (SSC REASONING) Part-3

Total Questions: 50

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

69 + 2485 x 5 - 912÷2 =?

Correct Answer: (a) 1396
Solution:Given:- 69 + 2485 x 5- 912 ÷ 2=?
Ås per given instruction after
interchanging '+ and '-' and 'x' and''we
get
69-2485÷5 +912 x 2
69-497 + 1824 = 1396

2. What will come in the place of '? in the following equation, if '+' and '-'are interchanged and 'x' and '÷' are interchanged?

25+3÷9-14 x 2 = ?

Correct Answer: (b) 5
Solution:Gjven:- 25+3÷9-14 x 2 = ?
As per given instruction after
interchanging '+'and '' and 'x' and''we
get,
25-3 x 9 +14 ÷2⇒25- 27 +7 = 5

3. Select the number that will come in the place of the question mark(?), if '+' and '-'are interchanged and 'x' and '÷' are interchanged?

63 x 7÷13-64+ 42 = ?

Correct Answer: (c) 139
Solution:Given:- 63 x 7÷13-64+42 = ?
As per given instruction after
interchanging '+' and '- and 'x' and'÷'we
get,
63÷7 x 13 + 64-42
9 x 13+22 = 117+ 22 = 139

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

6408 x 8 +27-15÷10 =?

Correct Answer: (b) 924
Solution:Given :- 6408 x 8+ 27 -15÷10 =?
As per given instruction after
interchanging '+ and -' and 'x' and'÷'we
get
6408÷8-27+15 × 10
801-27 + 150 = 924

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

152÷6 + 1617 x 7-77 =?

Correct Answer: (c) 758
Solution:Given:- 152÷ 6 +1617 x 7-77 =?
As per given instruction after
interchanging '+ and '- and 'x' and '÷'we
get
152 x 6-1617÷7+77
912-231 + 77 = 758

6. Which two numbers (not digits) should be interchanged to make the given equation correct ?

6×3+8÷2+21+5x4-14÷7 = 53

Correct Answer: (d) 21 and 14
Solution:Given:-6x3+ 8 ÷ 2 +21+
5 x4-14 ÷ 7 = 53
After going through all the options,
option (d) satisfied. After interchanging
21 and 14 we get,
6×3+8÷ 2+ 14+5 x 4-21 ÷ 7
18+4 +14+ 20 - 3 = 53
L.H.S. = R.H.S

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

125÷5+ 1809 x 9 - 14 = ?

Correct Answer: (b) 438
Solution:Given :- 125 ÷5+1809 x 9-14 = ?
As per given instruction after
interchanging '+ and ' and 'x' and '÷' we
get
125 x 5 - 1809 ÷9+14
125 x 5- 201 + 14
625-201 + 14 = 438

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

14-45 ×5+6÷3 = ?

Correct Answer: (c) 5
Solution:Given :- 14- 45 x 5 + 6÷3=?
As per given instruction after
interchanging '+ and ''and 'x' and '÷'we
get
14 + 45÷5-6 × 3⇒ 14+9-18= 5

9. Which two signs should be interchanged to make the following equation correct ?

29 x 145+5-640÷15 = 216

Correct Answer: (a) ÷ and +
Solution:Given:- 29 x 145+ 5 -640÷15 = 216
After going through all the options,
option (a) satisfied. After interchanging '
÷'and '+' we get,
29 × 145÷5-640+15
29 x 29 - 640 +15⇒ 841 - 625 =216
L.H.S. = R.H.S.

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

7÷5-30x 6+ 4 = ?

Correct Answer: (b) 36
Solution:Given :-7÷ 5-30 x 6+4 = ?
After interchanging + and - and÷ and x
we get,
7×5+ 30÷6-435+5-4 =36