4 notebooks+1 pen = 1 notebook +3 pens
Then we can know: 3 notebooks =2 pens.
Then the price ratio of notebook and pen is 2: 3.
It took 22 yuan five books and four pens.
2×5+4×3=22
22÷22= 1 yuan
Then the price of a pen is 1×3=3 yuan.
The price of a notebook is 1×2=2 yuan.