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The number of seats available for Biology and Computer Science in a school is in the ratio 5:8. They are to be increased by 30% and 25% . Find the new ratio.

Correct answer: B. 13:20

  • A. 6:10
  • B. 13:20
  • C. 3:4
  • D. 35:33

Explanation

Take the original numbers as 5k and 8k. After the increases they become 5k(1.30) = 6.5k and 8k(1.25) = 10k, so their ratio is 6.5:10 = 13:20. The likely mistake is choosing 6:10 by increasing the first term by 20% or by rounding 6.5 to 6.

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