Question

If two pens and three pencils cost 86. Four pens and a pencil cost 112. How much does a pen cost?

Answer 1

Let the cost of one pen be x

Let the cost of one pencil be y

Then 2x+3y=86

Answer 2

Answer:

let , the cost of a pen be Rs x

and the cost of a pencil be Rs y

a/c

2x + 3y = 86 ........... I

4x + y = 112 ..........II

now,

taking eq. II

y = 112-4x .........IIII

putting IIII in I

2x + 3 (112-4x)= 86

2x + 336-12x=86

-10x=86-336

-10x= -250

x=25

then

4 (25)+y=112

y=112-100

y=12