Question

the cost of 15 pens is rupees 180 . what is the cost of 27 pens ? how many pens can we purchase for rupees 420 ?​

Answer 1

Answer:

Let the cost of 1 pen= Rs.x

Cost of the 15 pens = Rs.15x

According to Questions,

15x=180

x=180/15=12

Cost of 27 pens = Rs.27x = Rs.27×12 = Rs.324

Answer 2

Cost of 15 pens=180

cost of 27 pens= ?

so,

cost of 1 pen=180/15

*cost of 27 pens = (180/15)*27

= 12*27

= ₹ 324

In 180 rupees 15 pens we can purchase

so,

In ₹1 = 15/180 pens we can purchase

* In ₹420 = [(15/180)*420] pens we can purchase

= 1/12 *420

= 35 pens we can purchase