If 15% of A = 20% of B = 30, then A + B = ? MCQ with Answer and Explanation

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If 15% of A = 20% of B = 30, then A + B = ?

A. 400

B. 200

C. 350

D. 300

Answer: Option C

Solution (By JKSSB Mock Tests)

A = 30/0.15 = 200, B = 30/0.2 = 150, sum = 350.

This question belongs to: Maths Percentage

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Question #1

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A can do a piece of work in 20 days. B is 25% more efficient than A. How many days will B alone take to do the work?

A. 14 days

B. 18 days

C. 16 days

D. 15 days

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Correct Answer: Option C

Explanation:
Efficiency ratio A:B = 100:125 = 4:5. Time ratio = 5:4. B's time = (4/5)×20 = 16 days.

This question belongs to: Maths Percentage

Question #2

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Fresh fruit has 72% water, dry fruit 25% water. Dry fruit from 120 kg fresh fruit:

A. 44.8 kg

B. 42 kg

C. 50 kg

D. 48 kg

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Correct Answer: Option A

Explanation:
Dry matter in fresh = 28% of 120 = 33.6 kg, in dry fruit 75% is dry matter, weight = 33.6/0.75 = 44.8 kg.

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Question #3

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Sold watch at 8% loss. If sold for Rs. 104 more, gain 8%. Cost price:

A. 675

B. 600

C. 650

D. 625

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Correct Answer: Option C

Explanation:
CP=x, SP=0.92x. 0.92x+104=1.08x → 0.16x=104 → x=650.

This question belongs to: Maths Percentage

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