Question

甲乙丙三根木根直插在水池中,三根木棒的长度之和是360厘米,甲木棒的3/4露出水面,乙木棒的4/7露出水面,

Answer 1

45

a/(1-3/4)+a/(1-4/7)+a/(1-2/5)=360

a=360/(4+7/3+5/3)=45