Before the standard reference answer went up, AB was 7:3. After the price increase, A has not changed, and B has added one. 70 yuan, whose A went up, gave each one to 10 yuan, and just returned it. B 70 yuan will get 10 yuan per share, leaving 70- 10× 3 = 40 yuan. This 40 yuan was added by B.

Then, b original price = (40- 10) × 3 = 90 yuan.

A original price = (40- 10) × 7 = 2 10 yuan.