Question

一项工程,甲单干24天完成,乙单干12天完成,甲乙合作3天后,剩下的甲干,甲队还要再干几天

Answer 1

[ 1-3(1/24+1/12) ] / (1/24)

=[1-3*(1/8)] / (1/24)

=(5/8) / (1/24)

=15

即 还要再干15天