Mathmetics
ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams
Q1.  What would be the maximum value of Q in the equation ? 
1)  4  2)  6 
3)  8  4)  9 
5)  None of these 
Answer : 8
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Q2. 

1)  Rs.800  2)  Rs.840 
3)  Rs. 880  4)  Rs.900 
5)  None of these 
Answer : Rs.900
Explanation :
Explanation :
Let, the price of the pen be ‘x’ and that of a pencil be ‘y’.
16x + 12y = 720 or (16x) X 5/4 + 12y X 5/4 = 720 X 5/4
or 20x + 15y = 900
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Q3. 

1)  Rs.400  2)  Rs.500 
3)  Rs.600  4)  Rs.300 
5)  None of these 
Answer : Rs.300
Explanation :
Explanation :
Given, A + B + C = 1200
or A + B + 2C = 700 + 800 = 1500
or 1200  C + 2C = 1500
or C = 1500  1200 = 300
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Q4. 

1)  Rs.6500  2)  Rs. 7500 
3)  Rs.9000  4)  Rs.12000 
5)  None of these 
Answer : Rs. 7500
Explanation : Let, the man's income be Rs.x.
Explanation : Let, the man's income be Rs.x.
Expenditure on food = x/3 and expenditure on house rent = 2x/5
His saving = x  (x/3 + 2x/5) = 4x/15
So,4x/15 = 2000
or x =( 2000 X 15 ) /4 = 7500.
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Q5. 

1)  38  2)  40 
3)  48  4)  56 
5)  None of these 
Answer : 40
Explanation :
Explanation :
Let, one number be x.
The other number = (88  x)
x x 3/10 = (88  x) x 36/100
= 30x = 3168  36x
x = 3168/66 = 48
The smaller number = 88  48 = 40
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Q6. 

1)  Rs. 210  2)  Rs. 130 
3)  Rs. 180  4)  Rs. 170 
5)  None of these 
Answer : Rs. 170
Explanation :
Explanation :
Let, the C.P. of 1 tube light be Rs.5x
C.P. of 1 bulb = Rs. 2x
4 x 5x + 3 x 2x = 260
x = 260/26 = 10
C.P. of 1 tube light and 6 bulbs
= 5 x X + 6 x 2 xX
= 5 x 10 + 12 x 10 = Rs.170
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Q7. 

1)  1000  2)  1200 
3)  1400  4)  2000 
5)  None of these 
Answer : 1000
Explanation : Let, total numbers of students are x.
Explanation : Let, total numbers of students are x.
Girls = 3x/7. and boys = 1  3x/7 = 4x/7.
Below 10 years boys = (4x/7) 1/4 = 4x/28 = x/7
The girls are also below ten years of age = (3x/7) 5/6 = 5x/14
So, above ten years = x  (x/7 + 5x/14) = x x/2 = x/2
Given, x/2= 500
or x = 1000.
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Q8. 

1)  24  2)  36 
3)  48  4)  72 
5)  None of these 
Answer : 48
Explanation : Let, the number be x.
Explanation : Let, the number be x.
So,x48 = x/3
or xx/3= 48
or x = 72
Therefore, twothirds of 72 is 48.
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Q9. 

1)  30  2)  40 
3)  50  4)  60 
5)  None of these 
Answer : 60
Explanation : Given, A’s marks in Arithmetic is x and A’s marks in English y and x +y=150  (I)
Explanation : Given, A’s marks in Arithmetic is x and A’s marks in English y and x +y=150  (I)
so, x/3 = y/2
or 2x =3y
or 2x  3y = 0  (II)
Putting the value in both equation, we get y = 60.
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Q10. 

1)  2525  2)  2925 
3)  3025  4)  3225 
5)  None of these 
Answer : 3025
Explanation : We know that , the sum of the cube all natural number i.e. 1 n = [(n. n+1)/2]^{2}
Explanation : We know that , the sum of the cube all natural number i.e. 1 n = [(n. n+1)/2]^{2}
The sequence is (1^{3} + 2^{3}+ 3^{3} + 4^{3}+ …….. + 10^{3})
So, [(10 x 11)/2]^{2} = 3025
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