40% of a number is more than 20% of 650 by 190. Find the number?
Correct answer: C. 800
- A. 600
- B. 700
- C. 800
- D. 900
Explanation
First, 20% of 650 = 0.20 × 650 = 130. Therefore, 40% of the number is 130 + 190 = 320, so the number is 320 ÷ 0.40 = 800. The likely mistake is option b, 700, caused by adding 190 directly to 650 instead of comparing the two percentages.
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About Percentages
Percentages express a quantity as parts per hundred and support calculations involving increases, decreases, discounts, commissions, taxes, and successive changes. Questions require distinguishing percentage change from percentage points and identifying the original value when a final value and its percentage change are given.
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