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Given the ratio of male to female gym members, calculate how many more women than men use the gym

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A gym club has male and female members in the ratio  {boysratio}:{girlsratio} 

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There are {classsize} members altogether.

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The ratio of males to females at the gym club is  {boysratio} : {girlsratio}.

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We can divide the total number of members into {boysratio + girlsratio} groups, with {boysratio} of the groups for males, and {girlsratio} of the groups for females.

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{classsize} ÷ {boysratio + girlsratio} = {scalefactor}. 

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There are {boysratio} x {scalefactor} = {scalefactor*boysratio} males, as there are {boysratio} groups of males.

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There are {girlsratio} x {scalefactor} = {scalefactor*girlsratio} females, as there are {girlsratio} groups of females.

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However, we need to find how many more females than males there are.

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{scalefactor*girlsratio} - {scalefactor*boysratio} = {scalefactor*girlsratio - scalefactor*boysratio}

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There are {scalefactor*girlsratio - scalefactor*boysratio} more females than males.

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The number of girls in the ratio.

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The total number of pupils in the dance school.

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The factor by which the ratio sum is multiplied to get the class size.

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The number of boys in the ratio.

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The increment which is added to boysratio to ensure that there are more girls.

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How many more females than males attend the club?

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