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

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

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

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.

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

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

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.

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,x-48 = x/3
or x-x/3= 48
or x = 72
Therefore, two-thirds of 72 is 48.

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.

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 (13 + 23+ 33 + 43+ …….. + 103)
So, [(10 x 11)/2]2 = 3025
