3-5х43х76ха 5
3-3х4-12 х74 xа
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Given: a:b=5:9 , b:c=4:7
To find: a:b:c
Solution:
a:b:c=(5×4):(9×4):(7×9)
a:b:c=20:36:63
Note:
If A:B=a:b & B:C=m:n , then
A:B:C=am:bm:bn
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