In a certain coding system, 'make promising performance' is

Solution

I. 'make promising performance' is coded as '025'.

II. 'event won promising' is coded as '832'.

III. 'won indicates performance' is coded as '985'.

After decoding the codes, we get:

From statement I and II, we get 'promising' is coded as '2'.

From statement I and III, we get 'performance' is coded as '5'.

From statement I alone, we get 'make' is coded as '0'.

From statement II and III, we get 'won' is coded as '8'.

From statement II alone, we get 'event' is coded as '3'.

From statement III alone, we get 'indicates' is coded as '9'.

Therefore, 'make event' is coded as '30'.