If (3a+ 5b): (3a− 5b) = 5: 1, then find a:b?
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(3a + 5b) : (3a- 5b) = 5 : 1
》 3a + 5b = 15a - 25b
》 5b + 25b = 15a -3a
.》 30b = 12a
》 b:a = 12 : 30
》 a : b = 30 : 12
= 15 : 6 ( Answer )
■ In this time, we remember that all MULTIFICATION and PLAS are correct .
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