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- Question
If V = 12R / (r + R) , then R =
Options- A. Vr / (12 - V)
- B. Vr + (V /12 )
- C. V
- D. V / (r - 12 )
- Correct Answer
- Vr / (12 - V)
ExplanationWe have to rearrange the equation to make R the subject.
Start by cross multiplying by (r + R); V (r + R) = 12R
Multiply out the bracket Vr + VR = 12R
- 1. A sum of Rs. 3000 yields an interest of Rs. 1080 at 12% per annum simple interest in how many years ?
Options- A. 4 Years
- B. 3 Years
- C. 5 Years
- D. 2.5 Years Discuss
- 2. If x = (a/b) + (b/a), y = (b/c) + (c/b) and z = (c/a) + (a/c), then what is the value of xyz ? x2 ? y2 ? z2 ?
Options- A. ? 4
- B. 2
- C. ? 1
- D. ? 6 Discuss
- 3. Simple interest on a certain sum of money for 3 years at 18% per annum is half the compound interest on Rs. 9000 for 2 years at 10% per annum. The sum placed on simple interest is:
Options- A. Rs 3500
- B. Rs 875
- C. Rs 1750
- D. Rs 1400 Discuss
- 4. If [a + (1/a)]2 ? 2[a ? (1/a)] = 12 , then which of the following is a value of 'a'?
Options- A. ? 8 + ?3
- B. ? 8 ? ?3
- C. ? 8 + ?5
- D. None of these Discuss
- 5. The simple interest on a certain sum of money at the rate of 5% per annum for 8 years is Rs. 840 . Rate of interest for which the same amount of interest can be received on the same sum after 5 years is
Options- A. 7%
- B. 8%
- C. 9%
- D. 10% Discuss
- 6. If x2 ? 4x + 1 = 0 , then what is the value of x9 + x7 ? 194x5 ? 194x3 ?
Options- A. 4
- B. ? 4
- C. 1
- D. ? 1 Discuss
- 7. A sum becomes Rs 1392 in 2 years and Rs 1488 in 3 years at simple interest. What is the rate (in percentage) of interest per annum?
Options- A. 8
- B. 10
- C. 12
- D. 8.5 Discuss
- 8. If x + y = 3, then what is the value of x3 + y3 + 9xy ?
Options- A. 15
- B. 81
- C. 27
- D. 9 Discuss
- 9. The rate of simple interest per annum at which a sum of money double itself in 162?3 yrs. is
Options- A. 4%
- B. 5%
- C. 6%
- D. 6 2/3% Discuss
- 10. A = (x8 ? 1)/(x4 + 1) and B = (y4 ? 1)/(y2 + 1). If x = 2 and y = 9, then what is the value of A2 + 2AB + AB2?
Options- A. 96475
- B. 98625
- C. 92425
- D. 89125 Discuss
More questions
Correct Answer: 3 Years
Correct Answer: ? 4
Correct Answer: Rs 1750
Correct Answer: None of these
Correct Answer: 8%
Correct Answer: ? 4
Correct Answer: 8
Correct Answer: 27
Correct Answer: 6%
Correct Answer: 98625
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