Passenger boat

Two-fifths of the passengers in the passenger boat were boys. 1/3 of them were girls and the rest were adult. If there were 60 passengers in the boat, how many more boys than adult were there?

Correct result:

x =  8

Solution:

$$\begin{gathered} b=60\cdot 2\mathrm{/}5=24 \\ g=60\cdot 1\mathrm{/}3=20 \\ a=60-(b+g)=60-(24+20)=16 \\ x=b-a=24-16=8 \end{gathered}$$

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