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What is 40% of the sum of the first 175 natural numbers?

Answer and explanation

Correct answer: 6160

First calculate the sum of the first 175 natural numbers using Sₙ = n(n + 1)/2. Thus S₁₇₅ = 175 × 176 / 2 = 175 × 88 = 15400. Next, express 40% as 40/100 = 2/5. Therefore, 40% of the required sum is (2/5) × 15400 = 2 × 3080 = 6160. Hence option C is correct. Another check is that 20% of 15400 is 3080, so 40% must be twice that amount, or 6160. Options A, B, and D do not result from applying 2/5 to 15400; they may come from an incorrect sum or percentage calculation. The order of operations matters: find the complete natural-number sum first, then calculate its percentage.

Related tags

Sum Of Natural NumbersPercentageSequencesFormulaSum Of First N Natural NumbersSequences And ProgressionsMathematicsClass 9 Mcq

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