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? Choose the correct choice from the following:
A) 90	B) 100	C) 110	D) 120	E) 140
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= 
<gadget id="calculator">7 + 3</gadget>
<output>10</output>
10   10x= 100   Option '100'
<result>B</result>
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?