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 By: fanny6573 (offline)  Saturday, April 21 2012 @ 05:55 AM CDT (Read 1339 times)
fanny6573

Hi pls help!

An alien grows to a weight of 120kg in 75 days by doubling its mass every day. How many days does it take to grow to a mass of 1 kg 875g?

Thanks.

Junior

Registered: 07/19/10
Posts: 28

 By: MathIzzzFun (offline)  Sunday, April 22 2012 @ 04:58 PM CDT
MathIzzzFun

Quote by: fanny6573

Hi pls help!

An alien grows to a weight of 120kg in 75 days by doubling its mass every day. How many days does it take to grow to a mass of 1 kg 875g?

Thanks.

Hi

1 kg 875g --> 15/8 kg
120 kg --> 15 x 8 kg
120 kg / 1kg875g = 8 x 8 = 2 x 2 x 2 x 2 x 2 x 2
75 - 6 = 69
So, the alien will grow to a mass in 69 days

cheers.

Chatty

Registered: 04/02/10
Posts: 36

 By: fanny6573 (offline)  Monday, April 23 2012 @ 04:12 AM CDT
fanny6573

Thanks for the solution.

Junior

Registered: 07/19/10
Posts: 28

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