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MATH HELP Needed ASAP!

[From: ] [author: ] [Date: 11-10-25] [Hit: ]
so I understand?Thanks!-48lbs / .60 lbs / .take 20% of 48 and ADD that to 48. (48*.......
A radioactive chemical decays 20% each day. If 48 pounds of this chemical remain today, how many pounds of this chemical were present two days ago?

Can you show work please, so I understand?
Thanks!

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48lbs / .80 = 60 lbs -----yesterday

60 lbs / .80 = 75 lbs ----two days ago

that was the easy way

the REAL way

take 20% of 48 and ADD that to 48. (48*.20) = 12lbs 12 + 48 = 60lbs

Take 20% of 60 and ADD that to 60 (60*.20) = 15lbs 15 + 60 = 75lbs

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Suppose two days ago there were x pounds.

After one day, there are x - 0.2x = 0.8x left.

After another day, there are (0.8x) - 0.2*(0.8x) = 0.64x left.

0.64x = 48 pounds.

x = 48 / 0.64 = 74 lb.
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