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Five apples weigh 1 kg, which is worth 5 yuan, and 15 oranges weigh 1 kg, which is worth 4 yuan. Now I plan to buy 20 oranges and some apples, so that they weigh less than 4.5 kg and are worth more than 19 yuan. How many apples can I buy This is a linear inequality of one variable
The average apple is 1 yuan, and the average orange is 4 / 15 yuan
The average weight of apples is 1 / 5kg, and that of oranges is 1 / 15kg
Let's sell x apples
(1) 20 * 1 / 15 + 1 / 5 * X19
Finally, x = 13 or 14 or 15
An orange 5 yuan, an Apple 6 yuan, buy orange and apple 160, pay 870 yuan, bought () apple
The formula
If you buy x apples, you will get (160-x) oranges
6X+5(160-X)=870
5X=70
X=14
An orange is 5 yuan, an apple is 6 yuan, buy a total of 160 oranges and apples, pay 870 yuan, bought (14) apples
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