Multiple choice

The ratio of monthly income of Anuradha and Bani is 3 :5.If income of each is increased by Rs 160, this ratio becomes 25 : 41.What is the Anuradha's monthly income before increment?

  1. Rs.3840

  2. Rs.9000

  3. Rs 2720

  4. Rs 1570

  5. Rs 2570
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A Correct answer
Explanation

Let original incomes be 3x and 5x. After increment of 160 each: (3x + 160)/(5x + 160) = 25/41. Cross-multiply: 41(3x + 160) = 25(5x + 160), which gives 123x + 6560 = 125x + 4000, so 2x = 2560, x = 1280. Anuradha's original income = 3 × 1280 = Rs. 3840.

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