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The school held a math festival and bought 22 12 pencil boxes as prizes. How much do you have to pay?
Let each pencil box be X yuan, then according to the first condition, we can know that each pen is (100-5X)/2 yuan.

According to the second condition, the equation 4x+7 * (100-5x)/2 =161.

Solve the equation X= 14, that is, each pencil box 14 yuan.

Then each 15 yuan.

I hope it helps you ~ ~

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