Question

A can contains a mixture of two liquids A and B in the ratio 7 : 5. When 9 litres of mixture are drawn off and can is filled with B, the ratio of A and B becomes 7 : 9. How many litres of liquid A was contained
by the can initially?
(a) 28 (b) 21 (c) 25 (d) 23

Answer 1

Answer:

Step-by-step explanation:

c-25

Answer 2

Answer:

option b

Step-by-step explanation:

Let the can initially contain 7x litre and 5x litre of mixture A and B respectively. Thus out of 12x litre of total mixture, 9 litre were taken out.  

Quantity of A in mix. left

= 7x - 9/12x * 7x

= 28x-21 / 4 litre

Quantity of B in mix. left

= 5x- 9/12x*5x  

= 20x-15 / 4 litre

Therefore ratio  

7:9

or x = 3

Option b