Solution: Suppose Xiao Ming answers the X question correctly, then Xiao Ming answers the (20-x) question incorrectly.

According to the meaning of the question, we can get: 5x-3(20-x)=52

Solution: x= 14

Test: score: 14×5=70, deduction: 6×3= 18, so 70- 18=52.

A: Xiao Ming got it right 14.