a drinking glass has the shape of a truncated cone. if the internal radii of the base and the top are 3cm and 4cm respectively and the depth is 10cm. if the glass is filled with water to a depth of 5cm, find the volume of the water

i found out that the equation of the line is x=4-(y/10)

and then using the volume formula between y=5 and y=0 i integrated it and worked it out to be 845pi/12 BUT the answer says the volume is 635pi/12 can anyone tell me where i went wrong?

thankyou !!