A 40 liters mixture of milk and water contains milk and water in the ratio 6:4. 20 liters of the mixture is removed and replaced whit pure milk, and the operation is repeated once more. What is the ratio milk and water in the resultant mixture?
a. 9:1
b. 4:1
c. 1:9
d. 6:4
pls explain the method
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Answer:
a) 9:1
Step-by-step explanation:
40l mix in 6:4
=> 24L milk and 16L water
step 1-a
20l mix removed
=> 12l milk and 8l water
step 1-b
20l milk added
new mix
32l milk + 8l water
repeat
step 2-a
20l mix removed
=> 16l milk + 4l water
step 2-b
20l milk added
=> 36l milk + 4l water
milk: water = 36:4
= 9:1
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