Question

The cost of 1 dozen pens is rupees 144.Find the cost of 30 pens.​

Answer 1

Answer:

cost of 30 pens  = 360 Rs

Step-by-step explanation:

1 dozen = 12

therefore cost of 12 pens = 144

hence 1 pen cost = 144/12 = 12 Rs.

Now,

cost of 30 pens = 30 x 12 = 360 Rs

Answer 2

Answer:

Let the cost of 1 pen= 144÷12 =12

so the cost of 30pen = 12*30= 360