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