Question

The cost of one book is x rupee and the cost of one pen is y rupee .The total cost of 8 books and 4 pens is 140. The cost 4 books and 8 pens is 100. Cost of 1 pen is *​

Answer 1

Answer:

Let cost of book be x & cost of pen be y

⇒8x+5y=420;⇒5x+8y=321

Adding = 13x+13y=741;x+y=57 ____ (1)

Subtracting = 3x−3y=99;x−y=33

substituting x=y+33 in equation (1) we get :

y+33+y=57⇒2y=24⇒y=12

so x=12+33=45

cost of 1 book & 2 pens = 45+2(12)= 45+24

=69Rs

Answer 2

Answer:

usna sucide kia ha di koi problem thi or apka friend ka name batao ki kisna pucha