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- Question
- 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
- Correct Answer
- 60cc
ExplanationConcentration 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 - 1. 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
- 2. 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
- 3. if ?4 × 43/2 ÷ 4-3 = 2x, the value of x will be :
Options- A. 16
- B. 8
- C. 12
- D. 4 Discuss
- 4.
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 Discuss
- 5. The value of 12x2y4z3 ÷ (2xy2 × 3yz2) will be :
Options- A. 2xyz
- B. xyz
- C. 1 xyz
- D. 2 xyz Discuss
- 6. 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
- 7. If the price of petrol is increased by 20% and subsequently by 40%. If the original price was Rs25 per litre then what is then the final price per litre?
Options- A. 42
- B. 45
- C. 48
- D. 40 Discuss
- 8. The price of a product is increased by 20%. If the original price is Rs. 300, what is the final price of the product?
Options- A. 350
- B. 360
- C. 365
- D. 370 Discuss
- 9. If 35% of a number is 112, then the number is
Options- A. 380
- B. 300
- C. 320
- D. 35 Discuss
- 10. 75 % of a number when added to 75 is equal to that number. What is the number?
Options- A. 280
- B. 400
- C. 300
- D. 305 Discuss
Percentage problems
Search Results
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: 2400
Explanation:
SP - CP = 480
1.2x - x = 480
?0.2x = 480
?x = 2400
Correct Answer: 12
Explanation:
Correct Answer: 1 y
Explanation:
Correct Answer: 2xyz
Explanation:
Correct Answer: 25%
Explanation:
Total weight of alloy = 20+20+ 40 = 80g
Weight of tin = 20g
Percentage of tin = 20g/80g x 100
=25%
Correct Answer: 42
Explanation:
Final Price = 25 x (1 + 20/100) x (1 + 40/100)
=Rs.25 x 1.2 x 1.4
= Rs. 42
Correct Answer: 360
Explanation:
Final Price = Initial price + Initial price x 20/100
= Initial price x (1+20/100)
= Rs.300x(1.2)
= Rs.360
Correct Answer: 320
Explanation:
Let the number be y.
Then, 35% of y = 112
( 35 / 100 )y = 112
y = ( 112 x 100 ) / 35
= 320
Correct Answer: 300
Explanation:
Let 'x' be the required number
0.75x + 75 =x
? 0.25x=75
? x=75 / 0.25 =300
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