Question

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Answer 1

The 16:4 gets reduced- correct, because I got 4.1?

Answer 2

simple trick,
if side has ratio a:b
then area will have ratio a^2 :b^2
and volume will have ratio a^3 :b^3

Answer 3

so your 4:1 is actually ratio of heights(one of the side)

to find the ratio of volumes do
4^3 : 1^3 = ...

Answer 4

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See that's where I'm confused whether it's 4.1 or 64.1 ,
because when you simplify 16:4 you get 4:1 >:(

Answer 5

you want volume ratio

so 4^3 : 1^3 = 64 :1
thats it.