CBSE - Mathematical Operations

1 Mathematical Operations 

In this question, ∆ means ‘is greater than’, % means ‘is lesser than’, ⃞ means ‘is equal to’, = means ‘is not equal to’, + means ‘is a little more than’, × means ‘is a little less than’. Choose the correct alternative.

 If a ∆ b and b + c, then 

1) a % c
2) c + a
3) c % a
4) Can’t say

2 Mathematical Operations 

If Q means ‘add to’, J means ‘multiply by’, T means ‘subtract from’ and K means ‘divide by’, then 26 K 2 Q 3 J 6 T 4 = ?  

1) 10
2) 28
3) 30
4) 27

3 Mathematical Operations 

If ‘–’ means addition, ‘×’ means subtraction, ‘÷’ means multiplication and ‘+’ means division; then what will be the value of the following expression?

20 × 12 + 4 – 16 ÷ 5 = ?

1) 17
2) 80
3) 63
4) 97

4 Mathematical Operations 

If ‘×’ means ‘+’, ‘+’ means ‘÷’, ‘÷’ means ‘–’ and ‘-’ means ‘×’; then what will be the value of the following expression?

5 – 7 × 9 + 3 = 2

1) 36
2) 312
3) 48
4) 44

5 Mathematical Operations 

Find the quadratic equations whose roots are the reciprocals of the roots of 2x² + 5x + 3 ?

1) 3x² + 5x + 2 = 0
2) 5x² + 3x + 2 = 0
3) 3x² − 5x − 2 = 0
4) None

6 Mathematical Operations 

In a group of buffaloes and ducks the number of legs are 24 more than twice the number of heads. What is the number of buffaloes in the group ? 

1) 6
2) 18
3) 12
4) 24

7 Mathematical Operations 

If - means, + means x, means -, x means +, then which of the following equations is correct?

1) 52 4 + 5 x 8 – 2 = 36
2) 43 x 7 5 + 4 – 8 = 25
3) 36 × 4 -12 + 5 3 = 420
4) 36 – 12 x 6 3 + 3 = 60

8 Mathematical Operations 

‘+’ means ‘×’, ‘–’ means ‘÷’, ‘÷’ means ‘+’ and ‘×’ means ‘–’; then what will be the value of the following expression?

540 – 36 + 12 ÷ 75 × 55

1) 255
2) 512
3) 200
4) 235

9 Mathematical Operations 

Find out the two signs to be interchanged for making following equation correct

5 + 3 x 8 - 12 / 4 =3

1) + and -
2) - and /
3) + and x
4) + and /

10 Mathematical Operations 

In this question, α stands for ‘equal to’; β for ‘greater than’; γ for ‘less than’ and δ for ‘not equal to’.

If 6x α 5y and 2y β 3z, then 

1) 2x β 3z
2) 4x β 3z
3) 2x γ z
4) 4x α 3z