Find a:b if (3a+b) : (a+b) = 9:5
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Answer:
(3a+b): (a+b) = 9:5
(3 a+b) 5=(a+b) 9
15 a+5b=9a+9b
.15a-9a=9b-5b
6 a=4b
3 a=2b
a:b=2:3
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