How to calculate the mixture ratio of cement mortar m 10

M 10 cement mortar mix ratio: 32.5 cement 275KG, river sand 1450KG, water 320KG per cubic meter of mortar, mix ratio:1:5.27:1.16; M5 mixed mortar uses 250KG of 32.5 cement, 250kg of river sand 1450KG, 280KG of gypsum 100KG and 280kg of water per cubic meter, and the mixing ratio is1:5.8: 0.4:1.12.