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Math problem in Grade One: A store needs to buy 160 A and B commodities.
If there are x commodity A and (160-X) commodity B, there are

15X+35( 160-X) 1260

Solution: 65 < x < 68

Because x is an integer, x = 66,67.

There are two kinds of purchase schemes: one is A 66 block and the other is B 94 block;

Second, A scored 67 yuan and B scored 93 yuan.

The second scheme is profitable.

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