Question

一桶含盐率25%的盐水,到出24升后,再用水灌满,这时盐与水的比是1:7.求桶的容积?

Answer 1

设容积为x

25%*(x-24):[(1-25%)(x-24)+24]=1:7

7(x-24)*25%=75%*(x-24)+24

7(x-24)=3(x-24)+96

4(x-24)=96

x-24=24

x=48