SOLUTION: The ratio of domestic stamps to foreign stamps in John’s stamp collection is 3:1. If John sold thirty of his domestic stamps, the ratio of domestic stamps to foreign stamps would b

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Question 203409: The ratio of domestic stamps to foreign stamps in John’s stamp collection is 3:1. If John sold thirty of his domestic stamps, the ratio of domestic stamps to foreign stamps would be 1:2. How many foreign stamps does John have in his collection?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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The ratio of domestic stamps to foreign stamps in John’s stamp collection is 3:1.
If John sold thirty of his domestic stamps, the ratio of domestic stamps to foreign stamps would be 1:2.
How many foreign stamps does John have in his collection?
:
"The ratio of domestic stamps to foreign stamps in John’s stamp collection is 3:1."
d%2Ff = 3%2F1
d = 3f
:
"If John sold thirty of his domestic stamps, the ratio of domestic stamps to foreign stamps would be 1:2."
:
%28d-30%29%2Ff = 1%2F2
f = 2(d-30)
f = 2d - 60
replace d with 3f
f = 2(3f) - 60
f = 6f - 60
60 = 6f - f
60 = 5f
f = 60%2F5
f = 12 foreign stamps
;
:
Check solution
d = 3(12
d = 36 domestic stamps
:
Check in statement:
" John sold thirty of his domestic stamps, the ratio of domestic stamps to foreign stamps would be 1:2."
36 - 30 = 6 stamps
6/12 = 1/2