Question
A sum of Rs. 9,200 was divided between 'A' and 'B' such
that the amount received by 'B' was 30% more than that by 'A'. If 'A' and 'B' spent 10% and 25% of the respective amounts received by them, then find the sum of amounts spent by 'A' and 'B' together.Solution
Let the amount received by ‘A’ = Rs. ‘10x’ Then amount received by ‘B’ = 10x × 1.3 = Rs. ‘13x’ we have, 10x + 13x = 9200 So, x = 9200 ÷ 23 = 400 So, amount received by ‘A’ = 10 × 400 = Rs. 4,000 Amount received by ‘B’ = 13 × 400 = Rs. 5,200 Amount spent by ‘A’ = 4000 × 0.1 = Rs. 400
Amount spent by ‘B’ = 5200 × 0.25 = Rs. 1,300 So, required sum = 400 + 1300 = Rs. 1,700
What is the variance of first n natural numbers

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