If a quarter of the weight of a roast is lost in roasting, what weight of roast should be bought in order to have 3kg of roasted meat?

Question

anonymous · Answer

the answer is 4 Kgs

anonymous · Answer

Is it? thats what I think

anonymous · Answer

can you please explain how you worked it out?

anonymous · Answer

Ok think it this way:

if 4kg is split into quarters, it would be 1kg each, if one quarter is taken away then it is taking away 1kg, 4-1=3kg

anonymous · Answer

Btw, what grade is this?

anonymous · Answer

That means I got it right before! THANK YOU and this is yr 9 work (:

apoorvk · Answer

okay so let the initial weight be 'x'.
you lose 1/4th of the weight. so you lose x/4

so you are left with final minus initial

x - x/4

now what is left 3 kg

so, 3 = x- x/4

or, 3 = 3x/4

or, 12 = 3x

or, x =4

so 4 kg is the initial weight of roast you need to take!