Apples are 3.5 yuan per kilogram. How much is it to buy 0.5 kg apples?

3.5 times 0.5 equals 1.75 yuan, which is a written calculation,

Apple: 5 yuan 3 kg, banana: 10 yuan 2 kg, mother plans to buy 6 kg apple and 4 kg banana, how much should I pay?

6 △ 3 × 5 = 10 (yuan), 4 △ 2 × 10 = 20 (yuan), 10 + 20 = 30 (yuan); a: 30 yuan should be paid

Mr. Wang bought some apples. If each student is divided into three, there will be 25 more apples. If each student is divided into five, there will be 15 less apples. How many students are there in all

Students = (25 + 15) / (5-3) = 20
Do not understand can ask, help please adopt, thank you!

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