20% of 40 + ? % of 80 = 120
Correct answer: A. 140
- A. 140
- B. 120
- C. 160
- D. 180
Explanation
Twenty percent of 40 is (20/100) x 40 = 8, leaving 120 - 8 = 112 for the second term. If x% of 80 equals 112, then (x/100) x 80 = 112, so x = 140%; option a is correct, while option b results from forgetting to subtract the first 8.
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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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