Question

If 10 pens cost 60 rupees,what is the cost of 13 such pens?​

Answer 1

Answer:

78

Step-by-step explanation:

10pens=₹60

1pen =₹60÷10=6

13pens=₹60÷10×13

=₹6×13

=₹78

Answer 2

Answer:

78 rupees

Step-by-step explanation:

Let us suppose that cost of 13 pend is x rupees.

The number of pens and their cost vary in direct proportion. Let us express the ratios and obtain an equation.

$\frac{10}{60} = \frac{13}{x } \\ 10x = 780 \\ x = 78$

so, cost of 13 pens is 78 rupees