Subject :IMO Class : Class 6
The ratio of the volume of water in Bottle P to the volume of water in Bottle Q is 3 : 4. Rajeev drank 40 mL of the water from Bottle P and the ratio then became 13 : 20. How much water was there in bottle P at first?
(a) 60 mL
(b) 80 mL
(c) 300 mL
(d) 400 mL