A watch cost 4 times as much as a pen.A pen cost twice as much as a book. Roy paid $60 for a watch a pen and 2 books altogether. Find the price that Roy paid for a book

Question

I want the solution, which means how you do it.

Answer 1

w = 4p (This is extraneous information!)

p = 2b

p + 2b = $60

2b + 2b = $60

4b = $60

b = $15