beng

A tank with a square base contained water to a height of 10cm. Jason poured another 392 cm3 of water and the height of the water level increased to 12cm. How much water was in the tank at first?

2/5 of a rectangular container with a base area of 500 cm2 is filled with water. Another 1.75L of water is required to fill the tank to 3/4 of its capacity. What was the height of the water in the container at first?

thank you