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- A mixture contains milk and water in the ratio 7:3.
Question 1:
A mixture contains milk and water in the ratio 7:3. On adding 20 liters of water, the ratio of milk to water becomes 7:5. Total quantity of milk & water before adding water to it? A. 10
B. 100
Feedback milk:water = 7:3
7x : 3x + 20 = 7 : 5
5[7x] = 7[3x + 20]
35x = 21x + 140
35x - 21x = 140
14x = 140
x = 10
The quantity of milk in the original mixture is = 7 : 3 = 7 + 3 = 10
10x = 100
Short cut method:
milk:water = 7 : 3
after adding 20 liters of water
milk:water = 7 : 5
milk is same but water increse 20liters then the water ratio is increse 2 parts
1 part ---> 10 liters
The quantity of milk in the original mixture is = 7 : 3 = 7 + 3 = 10
10 parts ---> 100 liters (Answer is = 100)
Short cut method - 2 : for Only milk problems
milk : water
7 : 3
7 : 5
milk ratio same but water ratio 2 parts incress per 20 liters
2 part of ratio ---> 20 liters
1 part of ratio ---> 10 liters
10 part of ratio ---> 100 liters
7x : 3x + 20 = 7 : 5
5[7x] = 7[3x + 20]
35x = 21x + 140
35x - 21x = 140
14x = 140
x = 10
The quantity of milk in the original mixture is = 7 : 3 = 7 + 3 = 10
10x = 100
Short cut method:
milk:water = 7 : 3
after adding 20 liters of water
milk:water = 7 : 5
milk is same but water increse 20liters then the water ratio is increse 2 parts
1 part ---> 10 liters
The quantity of milk in the original mixture is = 7 : 3 = 7 + 3 = 10
10 parts ---> 100 liters (Answer is = 100)
Short cut method - 2 : for Only milk problems
milk : water
7 : 3
7 : 5
milk ratio same but water ratio 2 parts incress per 20 liters
2 part of ratio ---> 20 liters
1 part of ratio ---> 10 liters
10 part of ratio ---> 100 liters
C. 70
D. 30
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