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例1 将25千克盐放入100千克水中,盐水的含盐率是多少? 误解:25÷100×100％=0.25×100％=25％评析:盐水的含盐率=盐的重量÷盐水的重量×100％。本题中,已知盐是25千克,水是100千克,故盐水的重量应是(盐+水)=(25+100)千克。正解:25÷(25+100)×100％=0.2×100％
Example 1 25 kg salt into 100 kg of water, the salt content of salt is what? Misunderstanding: 25 ÷ 100 × 100% = 0.25 × 100% = 25% Comment: Saline salt rate = salt weight ÷ saline Weight × 100%. In this problem, the salt is known to be 25 kg and the water is 100 kg. Therefore, the weight of the brine should be (salt + water) = (25 + 100) kg. Positive solution: 25 ÷ (25 + 100) × 100% = 0.2 × 100%