Question

A student bought a book for Rs.35 and some pens.If the cost of a pen is Rs.15 and total cost is Rs.110,how many pens did he buy?​

Answer 1

Answer:

let price pf a book is x

and price of pen be y

then,

given x+y =110

so,

number of pens be (n)

x+(n)y=110

then 35 +(n)15=110

110–35 =(n)15

75=(n)15

then , (n)=75/15 = 5

so he can buy 5 pens

ans is 5

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