SOLUTION: 4/5 of a certain amount is 64.find 3/8 of the amount? and i have to submit this tomorrow so can you help?and also can you send me the working and answer with it please??????????

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Question 827725: 4/5 of a certain amount is 64.find 3/8 of the amount?
and i have to submit this tomorrow so can you help?and also can you send me the working and answer with it please????????????
PS THE QUESTION IS AT THE TOP IT IS THE FIRST PARAGRAPH
please write back
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Found 2 solutions by josgarithmetic, LinnW:
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Let m = "a certain number"

%284%2F5%29m=64
m=64%285%2F4%29

You want %283%2F8%29m and should compute it.

Answer by LinnW(1048) About Me  (Show Source):
You can put this solution on YOUR website!
Set x = the number
(4/5)x = 64
multiply each side by 5/4
x = (5/4)64
x = (5*64/4)
x = (5*16)
x = 80
Now we want (3/8)*80
(3/8)*80 = 3*80/8
= 3*10
= 30