Question 555603
{{{5=(2/3)b}}}
{{{5(3/2)=b}}}
{{{15/2=b}}}
{{{7.5=b}}}

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or
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logically if 5 is 2/3 then half of 5 is 1/3, 2.5=1/3 of the boat so 3(2.5)=whole boat=7.5