Two alloys have copper 70% and 40%. Mixed to get 55% copper. Ratio of mixing: MCQ with Answer and Explanation

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Two alloys have copper 70% and 40%. Mixed to get 55% copper. Ratio of mixing:

A. 1:2

B. 1:1

C. 2:1

D. 3:2

Answer: Option B

Solution (By JKSSB Mock Tests)

Alligation: (70-55):(55-40) = 15:15 = 1:1.

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1

A number is increased by 10% and then decreased by 10%. What is the net change?

A. 2% decrease

B. No change

C. 1% increase

D. 1% decrease

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Correct Answer: Option D

Explanation:
Net change = x^2 / 100 % decrease. 10^2 / 100 = 1% decrease.

This question belongs to: Maths Percentage

Question #2

If the price of a book is increased by 20%, its new price is Rs. 180. Original price was:

A. 140

B. 160

C. 150

D. 170

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Correct Answer: Option C

Explanation:
Let original price be P. 1.2P = 180 → P = 150.

This question belongs to: Maths Percentage

Question #3

A shopkeeper marks his goods 40% above cost price and allows a discount of 25%. Find his gain percent.

A. 3%

B. 4%

C. 5%

D. 6%

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Correct Answer: Option C

Explanation:
CP=100, MP=140, SP=140×0.75=105, gain 5%.

This question belongs to: Maths Percentage

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