First Question: The ratio of green balls to yellow balls in a bag is 3 : 7. When 9 balls of each color are removed, the ratio of green balls to yellow balls becomes 1 : 3. How many balls were originally in the bag? Second Question: A cylindrical glass of (inside) diameter 6 cm and height 11 cm is filled and then tilted to a 45 angle so that some water overflows. How much water (in mL) is left in it?