Question

The cost of toy telephone is same as cost of 4 balls . Express statement as a linear equation in two variable.also find the cost of getting 2 toy telephone packed if cost of 1 ball is Rs 5 and there is fined cost of Rs 2 for packing a toy telephone

Answer 1

$$\begin{gathered} \mathrm{Let}\mathrm{the}\mathrm{cost}\mathrm{of}1\mathrm{toy}\mathrm{telephone}=\mathrm{Rs}x \\ \mathrm{Let}\mathrm{the}\mathrm{cost}\mathrm{of}1\mathrm{ball}=\mathrm{Rs}y \\ \mathrm{Now},\mathrm{according}\mathrm{to}\mathrm{question}, \\ x=4y \\ \boxed{x-4y=0} \end{gathered}$$

$$\begin{gathered} \mathrm{Now},\mathrm{when}y=5,\mathrm{then}\mathrm{from}\left(1\right),\mathrm{we}\mathrm{get}x=20 \\ \mathrm{So},\mathrm{when}\mathrm{the}\mathrm{cost}\mathrm{of}1\mathrm{ball}=\mathrm{Rs}5,\mathrm{then}\mathrm{the}\mathrm{cost}\mathrm{of}\mathrm{a}\mathrm{toy}\mathrm{telephone}=\mathrm{Rs}20 \\ \mathrm{Cost}\mathrm{of}2\mathrm{toy}\mathrm{telephones}=\mathrm{Rs}40 \\ \mathrm{Cost}\mathrm{of}\mathrm{packing}\mathrm{a}\mathrm{toy}\mathrm{telephone}=\mathrm{Rs}2 \\ \mathrm{So},\mathrm{cost}\mathrm{of}\mathrm{packing}2\mathrm{toy}\mathrm{telephones}=\mathrm{Rs}4 \\ \mathrm{So},\mathrm{total}\mathrm{cost}\mathrm{of}2\mathrm{toy}\mathrm{telephones}=\mathrm{Rs}40+4=\mathrm{Rs}44 \end{gathered}$$