Question 184974
I'll answer the first two questions to get you going in the right direction.



Let m=weight of Melanie, r=weight of one rabbit, g=weight of one goat, h=weight of one horse, and c=weight of one cow



Since "Melanie's weight is equal to the weight of 20 rabbits", this tells us that {{{m=20r}}}. Let's call this equation 1. 


Also, because "The weight of 50 rabbits is equal to the weight of 3 goats", this means that {{{50r=3g}}}. We'll make this equation 2.


In addition, the statement "The weight of 15 goats is equal to the weight of 12 horses" signifies that {{{15g=12h}}}. Name this equation 3.



Finally, the claim "The weight of 20 horses is equal to the weight of 12 cows" algebraically translates to {{{20h=12c}}}. Label this equation 4.


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Question # 1: The weight of 60 goats is equal to how many times the weight of Melanie.?


{{{50r=3g}}} Start with equation 2. 



{{{20(50r)=20(3g)}}} Multiply both sides by 20 (we want the right side to be 60g)



{{{1000r=60g}}} Multiply. So the weight of 100 rabbits is equal to the weight of 60 goats.



So this means that we want to find Melanie's weight compared to 1000 rabbits



{{{m=20r}}} Go back to the first equation



{{{50(m)=50(20r)}}} Multiply both sides by 50 (we want the right side to be 1000r, from before)



{{{50m=1000r}}} Multiply



So 50 times Melanie's weight is equal to the weight of 1000 rabbits which in turn is equal to the weight of 60 goats.



So this means that 50 times Melanie's weight is equal to the weight of 60 goats



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Question # 2: The weight of 24 horses is equal to how many times the weight of Melanie?


{{{15g=12h}}} Start with the third equation



{{{2(15g)=2(12h)}}} Multiply both sides by 2 (we want the right side to be 24h)



{{{30g=24h}}} Multiply



So 30 goats have the same weight as 24 horses



{{{50r=3g}}} Move back to the second equation



{{{500r=30g}}} Multiply both sides by 10 to get the right side to 30g



So 500 rabbits are of the same weight as 30 goats. This means that 500 rabbits are of the same weight as 24 horses (ie {{{500r=24h}}}).



{{{m=20r}}} Now go back to the first equation



{{{25m=500r}}} Multiply both sides by 25 to get the right side equal to 500r



So 25 times Melanie's weight is equal to the weight of 500 rabbits



Consequently, this means that 25 times Melanie's weight is equal to the weight of 24 horses.