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- Question
- 7 4 8 2 = 24
Options- A. -, x and x
- B. -, x and ÷
- C. x, - and ÷
- D. x, ÷ and -
- Correct Answer
- x, - and ÷
ExplanationLet us check all the options one-by-one.
From option (a),
7 - 4 x 8 x 2 = 24 (using VBODMAS rule)
? 7 - 64 = 24 ? -57 = 24
? LHS ? RHS ? RHS
So, option (a) is incorrect.
From option (b),
7 - 4 x 8 ÷ 2 = 24 (using VBODMAS rule)
? 7 - 4 x 8 ÷ 2 = 24 (using VBODMAS rule)
? 7 - 4 x 4 = 24 ? 7 - 16 = 24
? -9 = 24 ? LHS ? RHS
So, option (b) is incorrect .
From option (c),
7 x 4 - 8 ÷ 2 = 24 (using VBODMAS rule)
? 7 x 4 - 4 = 24 ? 28 - 4 = 24
? 24 = 24 ? LHS = RHS
So, option (c) is correct and hence, there is no need to check option (d). - 1. 16 (27) 43, 29 (?) 56, 36 (12) 48
Options- A. 23
- B. 33
- C. 27
- D. 37 Discuss
- 2. If K denotes 'X', B denotes '÷', 'T' denotes '-' and 'M' denotes '+', then 40 B 8 T 6 M 3 K 4 =?
Options- A. 19
- B. 11
- C. -31
- D. 23 Discuss
- 3. If A means '-' , B means '+', C means 'x', and D means '÷' then 32 D 4 B 7 C 2 A 6
Options- A. 18
- B. 24
- C. 36
- D. 16 Discuss
- 4. Select the correct combination of mathematical signs to replace '*' signs and to balance the given equation.
24 * 34 * 2 * 5 * 12
Options- A. + ÷ x =
- B. = ÷ + -
- C. = ÷ - +
- D. + ÷ = x Discuss
- 5. Which of the following sets of operation with the usual notations replacing the starts in the order given makes the statements valid?
? 100 * ? 16 * ? 225 * ? 1
Options- A. x, =, +
- B. +, =, -
- C. +, =, x
- D. -, x, = Discuss
- 6. If 264 * 2 = 6, 870 * 3 = 11, then what should 735 *5 be?
Options- A. 05
- B. 12
- C. 16
- D. 03 Discuss
- 7. 23 15 12
X 24 49
If 'X' is the resultant of the first row, what is the resultant of the second row?
Options- A. 24
- B. 25
- C. 28
- D. 22 Discuss
- 8. 37 12 21
38 81 14
What is the difference between the resultants of the two rows?
Options- A. 23
- B. 32
- C. 13
- D. 18 Discuss
- 9. 16 8 32
132 11 X 2
If X is the resultant of the first row, what is the resultant of the second row?
Options- A. 192
- B. 128
- C. 132
- D. 144 Discuss
- 10. 345 23 X
45 17 81
It 'X' is the resultant of the second row, what is the resultant of the first row?
Options- A. 285
- B. 33
- C. 135
- D. 34 Discuss
Mathematical Operations problems
Search Results
Correct Answer: 27
Explanation:
Here, Right number - Left number = Middle number
As, 43 - 16 = 27, 48 - 36 = 12
similarly, 56 - 29 = 27
? ? = 27
Correct Answer: 11
Explanation:
? 40 B 8 T 6 M 3 K 4 = ?
? 40 ÷ 8 - 6 + 3 x 4 = ?
? 5 - 6 + 12 = ?
? 17 - 6 = ?
? ? = 11
Correct Answer: 16
Explanation:
32 D 4 B 7 C 2 A 6
= 32 ÷ 4 + 7 x 2 - 6 = 8 + 7 x 2 - 6
= 8 + 14 - 6 = 22 - 6 = 16
Correct Answer: = ÷ - +
Explanation:
From option (c),
24 = 34 ÷ 2 - 5 + 12
? 24 = 17 - 5 + 12
? 24 = 29 - 5
? 24 = 24
Correct Answer: +, =, -
Explanation:
?100 + ?16
= ?225 -?1
10 + 4 = 15 - 1
? 14 = 14
Correct Answer: 12
Explanation:
Divide and add all numbers.
As, 264/2 = 132 ? 1 + 3 + 2 = 6
? 870/3 = 290 ? 2 + 9 + 0 = 11
Similarly, 735/5 = 147 ? 1 + 4 + 7 = 12
Correct Answer:
Explanation:
Rules
(i) (2-digit odd number) + (2-digit odd number)
(ii) 2-digit even number ? 2-digit perfect square odd number then, (odd number) - (Even number)
(iii) (3-digit number) ÷ (2-digit number)
(iv) (Prime number) + (Even number)
(v) (Even number) x (Even number)
Solution:
1st Row 23 15 12 ? 23 + 15 = 38
[rule (i)] ? 38 x 12 = 456 [rule (v)]
2nd Row X 24 49 ? 456 24 49
? 456 ÷ 24 = 19 [rule (iii)] ? 19 + 49 = 68 [rule (i)]
? Resultant of second row = 68
Correct Answer: 13
Explanation:
Rules
(i) (2-digit odd number) + (2-digit odd number)
(ii) 2-digit even number ? 2-digit perfect square odd number then, (odd number) - (Even number)
(iii) (3-digit number) ÷ (2-digit number)
(iv) (Prime number) + (Even number)
(v) (Even number) x (Even number)
Solution:
1st Row 37 12 21 ? 37 + 12 = 49 [rule (iv)]
? 49 + 21 = 70 [rule (i)]
2nd Row 38 81 14 ? 81 - 38 = 43 [rule (ii)]
? 43 + 14 = 57 [rule (iv)]
? Required difference = 70 - 57 = 13
Correct Answer: 192
Explanation:
Rules
(i) (2-digit odd number) + (2-digit odd number)
(ii) 2-digit even number ? 2-digit perfect square odd number then, (odd number) - (Even number)
(iii) (3-digit number) ÷ (2-digit number)
(iv) (Prime number) + (Even number)
(v) (Even number) x (Even number)
Solution:
1st Row 16 8 32 ? 16 x B = 128 [rule (v)]
? 128 ÷ 32 = 4 [rule (iii)]
X
2nd Row 132 11 X2 ? 132 11 16
? 132 ÷ 11 = 12 [rule (iii)]
? 12 x 16 = 192 [rule (v)]
? Resultant of second row = 192
Correct Answer: 34
Explanation:
Rules
(i) (2-digit odd number) + (2-digit odd number)
(ii) 2-digit even number ? 2-digit perfect square odd number then, (odd number) - (Even number)
(iii) (3-digit number) ÷ (2-digit number)
(iv) (Prime number) + (Even number)
(v) (Even number) x (Even number)
Solution:
2nd Row 45 17 81 ? 45 + 17 = 62 [rule (i)]
? 81 - 62 = 19 [rule (ii)]
1st Row 345 23 X ? 345 23 19
? 345 ÷ 23 = 15 [rule (iii)]
? 345 ÷ 15 + 19 [rule (i)]
? Resultant of first row = 34
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