Question 473685
If a/b=6/7 and a/c=2/5,what is the value of 3b+c in terms of a? 
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a/b=6/7
7a = 6b
b =  7a/6
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a/c=2/5
5a = 2c
c = 5a/2
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3b + c = 3(7a/6) + 5a/2
= 7a/2 + 5a/2
= 6a