Mathmetics

ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams

Q11.
What are the two natural numbers whose difference is 66 and the LCM is 360 ?
1) 90 and 24 2) 120 and 24
3) 120 and 54 4) 180 and 114
5)None of these
Answer : 90 and 24
Explanation : The factors of 360 = 2 X 2 X 2 X 3 X 3 X 5
So, two numbers are 2 X 2 X 2 X 3 =24 and 2 X 3 X 3 X 5 = 90
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Q12.
A shopkeeper sells some articles on profit of 20% of the cost price. Find out the actual Gain ?
I. Selling price of the article.
II. Cost price of the article
1) Neither I nor II 2) Either I or II
3) Both I and II 4) Only II
5)Only I
Answer : Either I or II
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Q13.
If x=2015, y=2014 and 2013 , then x2+y2+z2 -xy-yz-zx = ?
1) 2 2) 3
3) 4 4) 6
5)None of these
Answer : 3
Explanation : ATQ: x2+y2+z2 -xy-yz-zx
= x2-xy+y2 -yz+z2-zx 
x(x-y) + y((y-z) + z(z-x)
= 2015(2015-2014) + 2014(2014-2013)+2013(2013-2015)
= 2015 + 2014 + 4026
=4029-4026 =3

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Q14.
Directions:In each of the following questions a number series is given. After the series a number is given followed by (a),(b),(c),(d)&(e).Yoy have to complete the series starting with the number given, following the sequence of the given series, and answer the questions given below the series.

(A) 4 2 3 7.5 26.25 118.125
(B) 6 (a) (b) (c) (d) (e)

What will come in the place of (c) ?

1) 12.25 2) 11.5
3) 11.125 4) 12.5
5)None of these
Answer : None of these
Explanation : x .5, x1.5, x 2.5, x 3.5 , x 4.5 and so on   
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Q15.
Directions:In each of the following questions a number series is given. After the series a number is given followed by (a),(b),(c),(d)&(e).Yoy have to complete the series starting with the number given, following the sequence of the given series, and answer the questions given below the series.

(A) 2 3 7 25 121 721
(B) 3 (a) (b) (c) (d) (e)

What will come in the place of (c) ?

1) 31 2) 39
3) 45 4) 49
5)None of these
Answer : 49
Explanation : x 2 -1, x 3-2, x 4-3, x 5 -4 and so on ...
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Q16.
Directions:In each of the following questions a number series is given. After the series a number is given followed by (a),(b),(c),(d)&(e).Yoy have to complete the series starting with the number given, following the sequence of the given series, and answer the questions given below the series.

(A) 2 3 10 39 172 885
(B) 5 (a) (b) (c) (d) (e)

What will come in the place of (d) ?
1) 175 2) 196
3) 208 4) 244
5)None of these
Answer : 244
Explanation : x 1+12,, x 2+22, x 3+32, x 4+42 and so on ....  
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Q17.
Directions:In each of the following questions a number series is given. After the series a number is given followed by (a),(b),(c),(d)&(e).Yoy have to complete the series starting with the number given, following the sequence of the given series, and answer the questions given below the series.


(A) 3 12 30 66 138 282
(A) 7 (a) (b) (c) (d) (e)

What will come in the place of (b)?

1) 34 2) 46
3) 70 4) 76
5)None of these
Answer : 46
Explanation : x 2 +6 , x 2+6 , and so on      
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Q18.
Directions:In each of the following questions a number series is given. After the series a number is given followed by (a),(b),(c),(d)&(e).Yoy have to complete the series starting with the number given, following the sequence of the given series, and answer the questions given below the series.


(A) 7 20 46 98 202 410
(A) 4 (a) (b) (c) (d) (e)

What will come in the place of (d)?

1) 146 2) 162
3) 166 4) 184
5)None of these
Answer : None of these
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Q19.
Directions:In each of the following questions a number series is given. After the series a number is given followed by (a),(b),(c),(d)&(e).Yoy have to complete the series starting with the number given, following the sequence of the given series, and answer the questions given below the series.

(A) 9 10 16   57 212    1085
(A) 2 (a) (b) (c) (d) (e)

What will come in the place of (c)?

1) 15 2) 18
3) 25 4) 36
5)None of these
Answer : 15
Explanation : x 1 + 12, x 2 -22, x 3+32, x 4 -42 and so on   
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Q20.
Directions:In each of the following questions a number series is given. After the series a number is given followed by (a),(b),(c),(d)&(e).Yoy have to complete the series starting with the number given, following the sequence of the given series, and answer the questions given below the series.

(A) 3  5 22 13.5  35  19
(B) 5 (a) (b) (c)  (d)  (e)

What will come in the place of (c)?

1) 13 2) 14.5
3) 15.5 4) 16
5)None of these
Answer : 14.5
Explanation : +7 x 1/2 , +6 x 2 , + 5 x 1/2, + 4 x 2, so on  
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