Question

A 72 l mixture contains milk and water in the ratio 7 : 5. How much more milk is to be added to the mixture so that the new ratio of milk and water becomes 9 : 5?​

Answer 1

Answer:

12 litres

Step-by-step explanation:

milk in mixture = 72 (7 / 12)

= 6 x 7

= 42 lit

water in mixture = 72 (5 / 12)

= 6 x 5

= 30 lit

let x litres of milk be added then ratio becomes 9:5

(42 + x) / (30) = 9 / 5

5 (42 + x) = 9 (30)

210 + 5x = 270

5x = 270 - 210

5x = 60

x = 12