Question

已知3分之1a=4分之1b=5分之1c,求a：b：c

Answer 1

由1/3a=1/4b得a=3/4b；由1/4b=1/5c得c=5/4b；所以a:b:c=3/4b:b:5/4b=3:4:5

还可以这样做：令1/3a=1/4b=1/5=1,所以a=3;b=4;c=5;所以a:b:c=3:4:5