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. 3:2

C. 2:1

D. 1:1

Answer: Option D

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Percentage

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Question #1

A's salary increased by 20% then decreased by 20%. Original salary 5000, final salary:

A. 4800

B. 5200

C. 5000

D. 4600

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Correct Answer: Option A

Explanation:
5000 × 1.2 × 0.8 = 4800.

This question belongs to: Maths Percentage

Question #2

A number decreased by 15% becomes 170. Original number is:

A. 195

B. 205

C. 200

D. 190

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Correct Answer: Option C

Explanation:
0.85x = 170 → x = 200.

This question belongs to: Maths Percentage

Question #3

To pass an exam, 40% is required. A student got 150 marks and failed by 30 marks. Maximum marks are:

A. 450

B. 500

C. 550

D. 400

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Correct Answer: Option A

Explanation:
Pass marks = 150 + 30 = 180. 40% of Max = 180 → Max = 180/0.4 = 450.

This question belongs to: Maths Percentage

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