Discussion
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- Question
The value of x -2 y -4 ÷ y -2 is : x-3 . y-1 x-1
Options- A. y
- B. 1 y
- C. xy
- D. 1 xy
- Correct Answer
- 1 y
Explanation
- 1. The value of 12x2y4z3 ÷ (2xy2 × 3yz2) will be :
Options- A. 2xyz
- B. xyz
- C. 1 xyz
- D. 2 xyz Discuss
- 2.
The value of ( 2 3 ) 2/3 x ( 3 3 ) is : 3 2 2 2
Options- A. 64/3
- B. 82/3
- C. 62/3
- D. 91/3 Discuss
- 3.
The positive exponential function of a -3 a -4 is : a-5
Options- A. a2
- B. 1 a3
- C. 1 a4
- D. 1 a2 Discuss
- 4. If 102/5 × 108/5 = 10n, the value of n is :
Options- A. 2
- B. 3
- C. 6
- D. 4 Discuss
- 5. The value of ( 8 ) - ( 2 - 2 ) is :
Options- A. - 1 2 4
- B. - 3 2 4
- C. 3 2 4
- D. - 1 2 2 Discuss
- 6. if ?4 × 43/2 ÷ 4-3 = 2x, the value of x will be :
Options- A. 16
- B. 8
- C. 12
- D. 4 Discuss
- 7. The selling price and cost price of an article differs by 480. What is the selling price in case the profit percentage is 20%?
Options- A. 2400
- B. 2500
- C. 2600
- D. 2000 Discuss
- 8. If a person sells a wooden furniture at 8% profit against 8% loss, then he could had earned Rs12 more. What is the cost price of furniture?
Options- A. 72
- B. 70
- C. 80
- D. 75 Discuss
- 9. Calculate the amount of water which should be added to 80% solution of Sulphuric acid to make it a 50% solution?
Options- A. 60cc
- B. 80cc
- C. 75cc
- D. 70cc Discuss
- 10. An metallic alloy contains 20g copper, 20g tin and 40g silver.Then find out the percentage of tin in the alloy?
Options- A. 20%
- B. 30%
- C. 25%
- D. 40% Discuss
Surds and Indices problems
Search Results
Correct Answer: 2xyz
Explanation:
Correct Answer: 62/3
Correct Answer: 1 a2
Explanation:
Correct Answer: 2
Explanation:
? 102/5 × 108/5 = 10n
? 102/5 + 8/5 = 10n
? 1010/5 = 10n ? 102 = 10n ? n = 2
Hence, the value of n is 2.
Correct Answer: - 3 2 4
Explanation:
Correct Answer: 12
Explanation:
Correct Answer: 2400
Explanation:
SP - CP = 480
1.2x - x = 480
?0.2x = 480
?x = 2400
Correct Answer: 75
Explanation:
Let Cost Price (CP) = x
Then Selling Price(SP) if he sells at profit = x(1+8%) = 1.08x
and SP, if he sells at loss = x(1-8%) = 0.92%
Given, 1.08%-0.92% = Rs12
0.16x = Rs.12
?x = Rs.75
Correct Answer: 60cc
Explanation:
Concentration of Sulphuric acid = 80%
So in a 100cc, Sulphuric acid = 80cc and water = 20cc
Let x be the amount of water added to make concentration of 50%
?80/(100+x) = 50/100
? 80/(100+x) = 1/2
? x = 60cc
Correct Answer: 25%
Explanation:
Total weight of alloy = 20+20+ 40 = 80g
Weight of tin = 20g
Percentage of tin = 20g/80g x 100
=25%
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