If 30% of the first number plus 40% of the second number equals 60, and 40% of the first plus 30% of the second equals 66, find the first number. MCQ with Answer and Explanation

If 30% of the first number plus 40% of the second number equals 60, and 40% of the first plus 30% of the second equals 66, find the first number.

A. 150

B. 100

C. 140

D. 120

Answer: Option D

0.3x+0.4y=60 → 3x+4y=600; 0.4x+0.3y=66 → 4x+3y=660. Solve: x=120.

This question belongs to: Maths Percentage

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Question #1 Report Error

A dishonest dealer uses a scale of 90 cm instead of a metre scale and claims to sell at cost price. His gain percent is:

A. 11%

B. 11.11%

C. 10%

D. 9%

Correct Answer: Option B

Explanation:
Profit = (10/90)×100 ≈ 11.11%.

This question belongs to: Maths Percentage

Question #2 Report Error

If the price of sugar increases by 20%, by how much percent must consumption be reduced to keep expenditure constant?

A. 20%

B. 16.67%

C. 15%

D. 25%

Correct Answer: Option B

Explanation:
Reduction % = (20/120)×100 = 16.67%.

This question belongs to: Maths Percentage

Question #3 Report Error

0.02 as percent is:

A. 0.02%

B. 20%

C. 0.2%

D. 2%

Correct Answer: Option D

Explanation:
0.02 × 100 = 2%.

This question belongs to: Maths Percentage