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Question

In an unnamed gas station, water is mixed with petrol. In what ratio water must be mixed with petrol costing Rs. 78 per litre to get a mixture worth Rs. 62 per litre?

  • 8/29
  • 29/8
  • 8/31
  • 31/8
Answer- C

initially, the price of petrol is 78 rs

to get the price up to 62 rs, only 62rs of petrol should be added to litre and the remaining must be water which is for the balance 16 rs

so water and petrol are in the ratio 16/62 = 8/31.