In what ratio water be added to dilute honey costing Rs. 120 per litre so that the resulting syrup would be worth Rs. 100 per litre?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 1:5
Water costs Rs. 0 per litre. By the rule of alligation, with mean price Rs. 100:
\( \displaystyle \text{Water : Honey}=(120-100):(100-0) \)
\( \displaystyle =20:100 \)
\( \displaystyle =1:5 \)
Check: 1 litre of water and 5 litres of honey cost 5 × 120 = Rs. 600 for 6 litres, that is Rs. 100 per litre.