Question

Five pens and 10 pencils together cost rs 70 and the cost of a pen greater than 3 times the cost of pencil by 4. What is the cost of 1 pen

Answer 1

Answer:6

Step-by-step explanation:

Answer 2

The cost of 1 pen is Rs.10

Step-by-step explanation:

Let the cost of 1 pen be x

Let the cost of 1 pencil be y

We are given that Five pens and 10 pencils together cost rs 70

5x+10y=70  ---1

the cost of a pen greater than 3 times the cost of pencil by 4

So,x- 3y=4  ----2

Substitute the value of x from 2 in 1

5(4+3y)+10y=70

20+15y+10y=70

20+25y=70

25y= 50

y=2

Substitute the value of y in 2

x-3(2)=4

x=10

Hence The cost of 1 pen is Rs.10

#Learn more:

The cost of a pen is eight times the cost of a pencil. If the cost of 4 pens and 3 pencils is rs.210, find the cost of a pencil and a pen separately

https://brainly.in/question/6586656