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  • SSC CHSL Exam SSC CHSL Quantative Aptitude Study Material

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Mathematical Operations
In a camp 180 students had ration for 20 days. How many students should leave the camp if the ration should last for 25 days?

a) 36
b) 24
c) 28
d) 40



Answer
Solution
Correct Answer Is : 36
Solution Is : 180 students have ration for 20 days --> 180 * 20 = 3600 rations There are rations for 3600 persons . If rations are to be left for 25 days No of persons should be = 3600 / 25 = 144 persons Number of persons to leave the camp = 180 - 144 = 36
The sum of two digits of a number is 10. If the digits are interchanged, then its value increases by 18. Find the number.

a) 46
b) 64
c) 19
d) 28



Answer
Solution
Correct Answer Is : 46
Solution Is : Let the number be xy . x + y = 10 ---(1) yx is more than xy by 18 . Which is , (10y+x ) - ( 10x+y) = 18 9y - 9x = 18 y - x = 2 ----(2) From (1) and (2) (1) + (2) --> 2y = 12 ---> y = 6 x = 10 - 6 = 4 The number is 46 .
Which one of the following responses is correct ? 8 * 5 * 27 * 3 * 16

a) ×, =,
b) , =, ×, +
c) ×, =, +,
d)



Answer
Solution
Correct Answer Is : ×, =,
Solution Is : (1) 8*5=27-3+16 => 40=24+16 => 40=40
Some equations are solved on the basis of a certain system. On the same basis , find out the correct answer for the unsolved equation . 4 x 6 x 9 = 649
7 x 3 x 2 = 372
8 x 9 x 4 = ?

a) 489
b) 849
c) 948
d) 984



Answer
Solution
Correct Answer Is : 984
Solution Is :
Select the correct combination of mathematical signs to replace * signs and to balance the given equation.
15*3*5*20*2

a) + - = /
b) X - = x
c) + = / x
d) X - = +



Answer
Solution
Correct Answer Is : X - = x
Solution Is : Given equation --> 15 * 3 * 5 * 20 * 2 From option B , 15 x 3 - 5 = 20 x 2 45 -5 = 40 40 = 40
Which of the following interchanges of signs would make the given equation correct ?
24 + 6 x 3 / 3 - 1 = 14

a) + and x
b) X and -
c) / and +
d) - and /



Answer
Solution
Correct Answer Is : / and +
Solution Is : Given equation 24 + 6 x 3 / 3 - 1 = 14 From option C , 24 / 6 x 3 + 3 -1 = 14 4 x 3 + 3 - 1 = 14 15 - 1 = 14 14 = 14
Some equations are solved on the basics of a certain system. On the same basis, find out the correct answer for the unsolved equation. 8 * 7 * 5 = 578; 11 * 10 * 9 = 91011;
3 * 1 * 2 = 213; 7 * 4 * 2 = ?

a) 56
b) 247
c) 128
d) 282



Answer
Solution
Correct Answer Is : 247
Solution Is :
Which interchange of signs will make the following equation correcct?
(16 - 4) * 6 / 2 + 8 = 30

a) + and -
b) 4 and 2
c) - and +
d) 16 and 6



Answer
Solution
Correct Answer Is : + and -
Solution Is :
Choose the appropriate combination of signs to fill at places of * to solve the given equation .
(23 - 5) * ( 12 / 2 ) * 3 * 4

a) ++=
b) -/=
c) X+=
d) +-=



Answer
Solution
Correct Answer Is : -/=
Solution Is : Consider Option B ,
Given equation after putting signs according to question
(23-5)-(12/2) / 3 = 4
18 - 6 / 3 = 4
12 / 3 = 4
4 = 4
If the `+` and `-` signs are interchanged , similarly `x` and `/` signs are interchanged , then find the answer of the following equation .
10 - 2 + 12 x 1 / 0

a) 8
b) 12
c) 1
d) 0



Answer
Solution
Correct Answer Is : 12
Solution Is : Given equation ,
10 - 2 + 12 x 1 / 0
According to question , after interchanging the signs
10 + 2 - 12 / 1 x 0 = 12 - 12 x 0
= 12 - 0 = 12
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