SOLUTION: if a:b is 3:5 and b:c is 4:7, what is a:b:c?
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Question 464833: if a:b is 3:5 and b:c is 4:7, what is a:b:c?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
if a:b is 3:5 and b:c is 4:7,
what is a:b:c?
:
=
Cross multiply
5a = 3b
a = b
and
=
cross multiply
4c = 7b
c = b
:
a:b:c
Replace a and c:
b : b : b
Multiply by 20 to clear the denominators
4(3b) : 20b : 5(7)b
12b : 20b : 35b
therefore
a:b:c = 12:20:35
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