Book and pen price!
Algebra
Level
1
If a book and pen cost 110rs, and the book costs 100rs more than the pen, how much does the pen cost?
15
5
7.5
10
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1 solution
If x and y are the cost of book and pen respectively. X + Y = 110. ---------eq.1 X = Y + 100. ---------eq.2 Putting value of X from eq.2 To eq.1. 2Y + 100 = 110 =>Y = 5