Final answer:
The contrapositive of the statement 'If you have sea water, you can make salt' is 'If you cannot make salt, then you do not have sea water.'
Step-by-step explanation:
The contrapositive of the statement 'If you have sea water, you can make salt' is:
If you cannot make salt, then you do not have sea water.
The contrapositive of a conditional statement swaps the hypothesis and conclusion and negates both. In this case, the hypothesis 'you have sea water' is negated to 'you cannot make salt', and the conclusion 'you can make salt' is negated to 'you do not have sea water'.