Question

Mr. Hart owns a model train store. He uses magnets from the gadget factory for that train tracks.

Part A:

The table shows the relationship between the number of train tracks, t and that number of magnets needed, m.

Complete the table for the number of magnets needed m. Then write and equation that models this relationship

____t_____|_____m____

____1_____|_____5_____

____2_____|_____8_____

____3_____|_____?_____

____4_____|_____?_____

Equation: ?

Answer 1

Solution:

The selling price of washing machine = Rs. 13500

Loss percent = 20%

Let the cost price of the washing machine be Rs. x.

Loss = Loss% of C.P.

\Rightarrow⇒ Loss = 20% of Rs. x=\frac{20}{100}\times x=\frac{x}{5}x=

100

20

×x=

5

x

Therefore, S.P. = C.P. - Loss

\Rightarrow\ 13500=x-\frac{x}{5}\Rightarrow13500=\frac{4x}{5}⇒ 13500=x−

5

x

⇒13500=

5

4x

\Rightarrow\ x=\ \frac{13500\times5}{4}=\ Rs.\ 16,875⇒ x=

4

13500×5

= Rs. 16,875

Hence, the cost price of washing machine is Rs. 16,875.

Explanation: