It costs 34.5 yuan to buy an interesting set of math. It is known that the first volume is more expensive than the second volume 1.7 yuan, and the second volume is cheaper than the first volume in 0.4

It costs 34.5 yuan to buy an interesting set of math. It is known that the first volume is more expensive than the second volume 1.7 yuan, and the second volume is cheaper than the first volume in 0.4 yuan. How much is the upper, middle and lower levels? On the basis of the middle volume, subtract 1.7 yuan from the first volume and 0.4 yuan from the second volume, and the three volumes are equal.

34.5- 1.7-0.4 = 32.4 yuan.

32.4 Divided by 3 = 10.8 yuan (middle volume)

10.8+1.7 =12.5 yuan (I)

10.8+0.4 =11.2 yuan (Part II)

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