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In the sixth grade of primary school, there are 40 grams of salt water with a concentration of 20% and how much salt water with a concentration of 60% can be made into a concentration of 30%.
40g of 20% saline water, including 0.2 * 40 = 8g of salt and 0.8 * 40 = 32g of water.
Suppose x grams of physiological saline is added, and its concentration is 60%.
You can list:
(8+0.6x)/(32+0.4x)=0.3, and the solution is: x = 3.33333g