Cheese consumption

I have some cheese. I used 2/5 of the total amount of cheese yesterday. Today, I used 2/5 of the remaining cheese from yesterday.
If 900 g of cheese remain at the end of today, how many grams of cheese did I have originally?

Correct answer:

x =  2500 g

Step-by-step explanation:

r=125=35=0.6  x r r=900 x 0.6 0.6=900  0.36x=900  x=2500 g   Verifying Solution:  a=r x=0.6 2500=1500 g b=r a=0.6 1500=900 g

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