1.

6 book is 6000/7and price of 10 pens is rs 2400/11find the price of 2 books and 3pens

Answer»

ong>Step-by-step EXPLANATION:

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

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