According to the stem analysis, it can be concluded that 1 USD can be converted into RMB 7.5 yuan;

80÷ 120=23 (USD), that is, 10000 VND can be exchanged for 23 USD;

Therefore, 65,438+00,000 Vietnamese dong can is convertible: 23×7.5=5 (yuan),

A: 65,438+/kloc-0,000 Vietnamese dong is equivalent to RMB 5 yuan.

So the answer is: 5.