raju bought 5 notebooks and 4 pens for 148 rupee .but he need only 4 notebooks and 5 pens. it would cost 140 rupees only.what is the price of pen amd notebook.
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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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