Question
A mixture (milk + water + honey) contains β10mβ
litres milk, β15nβ litres water and 35 litres more honey than water. If 25% of the mixture was replaced with 5 litres of milk, then the quantity of water in the resultant mixture becomes 10% less than that of milk. Instead, if 25% of the mixture is replaced with 60 litres of honey, then the ratio of the quantity of milk to that of honey will become 1:2. Find the initial quantity of water in the mixture.Solution
According to the question, If 25% of the mixture was replaced with 5 litres of milk, then the quantity of milk in the resultant mixture = 10m Γ 0.75 + 5 = (7.5m + 5) litres. If 25% of the mixture was replaced with 5 litres of milk, then the quantity of water in the resultant mixture = 15n Γ 0.75 = β11.25nβ litres. ATQ; (7.5m + 5) Γ 0.90 = 11.25n Or, 7.5m + 5 = 11.25n Γ· 0.9 = 12.5n So, 7.5m = (12.5n β 5) β [equation I] If 25% of the mixture was replaced with 60 litres of honey, then the quantity of milk in the resultant mixture = 10m Γ 0.75 = β7.5mβ litres. If 25% of the mixture was replaced with 60 litres of honey, then the quantity of honey in the resultant mixture = (15n + 35) Γ 0.75 + 60 = 11.25n + 26.25 + 60 = (11.25n + 86.25) litres. So, 7.5m:(11.25n + 86.25) = 1:2 Or, 15m = 11.25n + 86.25 β [equation II] Multiplying equation (I) by β2β, we have: 15m = (25n β 10) So, (25n β 10) = (11.25n + 86.25) [from equation 2] Or, 13.75n = 96.25 So, n = 96.25 Γ· 13.75 β 7 Therefore, the initial quantity of water in the mixture = 15 Γ 7 = 105 litres.
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