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Verified Answer :

So Wilson has 60 chocolates    and we know 50% of 60= 30

So 30  -  20%= 18

18 is your answer

All you have to do is multiply \(30%*60\).  Remember though, 30% is a percentage out of 100, so really it's equal to \(\frac{30}{100} = \frac{3}{10} = 0.3\)

Now just multiply that decimal by the 60 chocolates!

\(60*0.3=18\)

So he gave away 18 chocolates!