Question

jane went to a book shop and bought a book. while at the store, she found a second interesting book and bought it for ruppees 80. the price of the second book is 10 less than 3 times the price of the first book. find the price of the first book

Answer 1

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

Answer 2

Answer:

While at the store, she found a second interesting book that cost $80. The price of the second book was $10 less than three times the price of the first book.

Explanation: