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I'm an IGCSE Maths Teacher - Post your questions here.

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i explained this same question yesterday to someone if u can find it..
anyways the only thing u need to know is that 1/3*pi*x*x*y = W
so a cone 3 times larger to radius x and hight y means 3x radius and 3y height
substitute this in the formula of cone
1/3*pi*3x*3x*3y
take
1/3*pi*x*x*y common so
1/3*pi*x*x*y(3*3*3)
=W(27)
=27W

ii is just similar to this one with different valuse
 
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