Question

Cost of three pens and five pencils is rs.100 ,ratio between cost of 1 pen and 1 pencil is 5:1. What is the cost of 1 dozen pen?

Answer 1

Answer:300

Step-by-step explanation:

let cost of 1 pencil be x

let cost of 1 pen be 5x

15x+5x=100

20x=100

x=5

cost of pencil =5

cost of pen =25

cost of a dozen pen=25x12=300

Answer 2

12×25=300

Step-by-step explanation:

let cost of 1 pen be 5x and of 1 pencil be x

according to the question,

(5x*3)+(x*5)=100

15x+5x=100

20x = 100

x = 100÷20

x = 5

therefore cost of 1 pen =₹25

so,cost of 1 dozen pen i.e.,12 pens =12*25

which is equal to ₹300