How much sand and cement you need to lay 65 sqm?

To lay 65 square meters of concrete, the amount of sand and cement required depends on the thickness of the concrete layer. For a typical thickness of 10 cm, you would need approximately 0.65 cubic meters of concrete. A common mix ratio is 1 part cement to 2 parts sand to 3 parts gravel. In this case, you would need about 130 kg of cement and around 0.26 cubic meters of sand. Adjustments may be necessary based on the specific mix design and project requirements.