Question

11) The mean expenditure of a person from monday to wednesday is Rs 250, and the mean expenditure from wednesday to friday is 400. If the spends Rs 300 on wednesday, find the mean expenditure of the person from monday to friday.

Answer 1

Dear student
$$\begin{gathered} \mathrm{Sum}\mathrm{of}\mathrm{expenditures}\mathrm{from}\mathrm{monday}\mathrm{to}\mathrm{wednesday}=250\times 3=\mathrm{Rs}750 \\ \mathrm{Sum}\mathrm{of}\mathrm{expenditures}\mathrm{from}\mathrm{wednesdday}\mathrm{to}\mathrm{friday}=400\times 3=\mathrm{Rs}1200 \\ \mathrm{Total}\mathrm{sum}\mathrm{of}\mathrm{expenditures}\mathrm{from}\mathrm{monday}\mathrm{to}\mathrm{friday}=\mathrm{Rs}\left(1200+750\right)-\mathrm{Rs}300=\mathrm{Rs}1650 \\ \mathrm{So},\mathrm{the}\mathrm{mean}\mathrm{expenditure}\mathrm{from}\mathrm{monday}\mathrm{to}\mathrm{friday}\mathrm{is}=\frac{1650}{5} \\ =\mathrm{Rs}330 \end{gathered}$$
Regards