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- Question
- If '+' means 'minus', '-' means 'multiply', '÷' means 'plus' and 'x' means 'divide', then 10 x 5 ÷ 3 - 2 + 3 =?
Options- A. 5
- B. 53/3
- C. 21
- D. 36
- Correct Answer
- 5
Explanation? = 10 x 5 ÷ 3 - 2 + 3
= 10 ÷ 5 + 3 x 2 - 3
Apply the rule BODMAS
Do things in Brackets First
(Powers, Roots) before Multiply, Divide, Add or Subtract.
Multiply or Divide before you Add or Subtract
= 10 ÷ 5 + 3 x 2 - 3
= 2 + 3 x 2 - 3
Addition
= 2 + 6 - 3
Subtraction
= 8 - 3 = 5 - 1. The sum of the ages of father and a son presently is 70 years. After 10 years, the son's age is exactly half that of the father. What are their ages now?
Options- A. 45 years, 25 years
- B. 50 years, 20 years
- C. 47 years, 23 years
- D. 50 years, 25 years Discuss
- 2. The average age of 19 boys in a class is 21 years. If the teacher's age is included, the average increases to 22 years. What is the teacher's age?
Options- A. 39 years
- B. 41 years
- C. 40 years
- D. 44 years Discuss
- 3. At present, the ratio between the ages of Arun and Deepak is 4 : 3. After 6 years, Arun's age will be 26 years. What is the age of Deepak at present?
Options- A. 12 years
- B. 15
- C. 19 years
- D. 25 years Discuss
- 4. A man was 31 years of age when he had his first son. His wife was 26 years of age when his son attained the age of 7 years. The difference in age between the man and his wife is :
Options- A. 7 years
- B. 9 years
- C. 5 years
- D. 12 years Discuss
- 5. Adam who is 20 years old is 4 times as old as Mary. What will be Mary's age when Adam is twice as old as her?
Options- A. 35 years
- B. 15 years
- C. 30 years
- D. 17 years Discuss
- 6. If "T" means (x), 'U' means (-) , 'X' means (÷) and W means (+), then what will be the value of the following expression?
(50 X 2) W (28 T 4 )
Options- A. 142
- B. 158
- C. 137
- D. 163 Discuss
- 7. Select the correct combination of mathematical signs to replace the * signs and to balance the given equation.
40 * 2 * 4 * 3 * 8
Options- A. + - ÷ =
- B. ÷ + = x
- C. + ÷ x =
- D. + x - = Discuss
- 8. 4 - 4 = 17, 6 - 6 = 37, 2 - 2 = 5, 5 - 5 =?
Options- A. 27
- B. 26
- C. 20
- D. 24 Discuss
- 9. If S means '-', Q means 'x' , R means '÷' and P means '+' then
1 P 45 R 2 Q 2 S 4 =?
Options- A. 40
- B. 42
- C. 36
- D. 46 Discuss
- 10. If '@' means 'x', 'c' means '÷' % means (+) and '$' means '-', then 6%12C3@8 $ 3 =?
Options- A. 37
- B. 35
- C. 39
- D. 33 Discuss
Mathematical Operations problems
Search Results
Correct Answer: 50 years, 20 years
Explanation:
Correct Answer: 41 years
Explanation:
The average age of 19 boys in a class = 21 years
Sum total of ages of 19 boys = 19 × 21 years = 399 years
The average age of 19 boys and teacher in a class = 21 years
Sum total of ages of 19 boys and teacher = 20 × 22 years = 440 years
? Age of teacher = Sum total of ages of 19 boys and teacher - Sum total of ages of 19 boys
Age of teacher = ( 440 ? 399 ) years = 41 years
Correct Answer: 15
Explanation:
Correct Answer: 12 years
Explanation:
Age of man at the birth of first son = 31 years
The age of wife at the birth of her son = 26 ? 7 = 19 years
Required difference = Age of man at the birth of first son - The age of wife at the birth of her son
Required difference = ( 31 ? 19 ) years = 12 years
Correct Answer: 15 years
Explanation:
Correct Answer: 137
Explanation:
Given expression, (50 x 2) W (28 T 4)
After interchanging the letters with symbols, we get
(50 ÷ 2) + (28 x 4) = 25 + 112 = 137
Correct Answer: ÷ + = x
Explanation:
Given, 40* 2* 4 * 3 * 8
Let us check all the options one by one.
From option (a), putting the signs in given equation, we get
40 + 2 - 4 ÷ 3
= 8 ? 42 - 4/3 = 8
? 126 - 4 = 24 ? 122 = 24
? L H S ? R H S
So, option (a) is incorrect.
From option (b), putting the signs in given equation, we get
40 ÷ 2 + 4 = 3 x 8
? 20 + 4 = 24 ? 24 = 24
LHS = RHS
Hence, option (b) is correct and there is no need to check remaining options.
Correct Answer: 26
Explanation:
As, 4 - 4 ? 4 x 4 + 1 = 17
6 - 6 ? 6 x 6 + 1 = 37
2 - 2 ? 2 x 2 + 1 = 5
Similarly, 5 - 5 ? 5 x 5 + 1 = 26
? ? = 26
Correct Answer: 42
Explanation:
After replacing the sign according to question
1 P 45 R 2 Q 2 S 4
Apply the BODMAS Rule
= 1 + 45 ÷ 2 x 2 - 4
= 1 + 22.5 x 2 - 4
= 1 + 45 - 4 = 42
Correct Answer: 35
Explanation:
? 6%12C3@8 $ 3 = ?
After replacing the sign according to the question
? 6 + 12 ÷ 3 x 8 - 3 = ?
Apply the BODMAS Rule
? 6 + 4 x 8 - 3 = ?
? 6 + 32 - 3 = ?
? 38 - 3 = ?
? ? = 35
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