Answer: The walkman should be $60, and Tom paid $12.
Step-by-step explanation:
If Tom's dad paid 48, and Tom paid 1/5, this means that his dad paid 4/5 (5/5 - 4/5 =1/5).
This means that 48 is 4/5 of the whole. Get 1/5 of the answer first. 48/4 is 12. This means that 1/5 of the price was $12, or how much Tom paid. Because we know that 1/5 cost $12, and 4/5 cost $48, we just have to add them together to get the full cost. This brings us to $60.
To represent this through an equation, we can write:
1/5x+48=x
after subtracting 1/5x on both sides, we get
48= 4/5x
This is already explained above, and that is how we find x (the total cost) and how much Tom paid.
Hope this helped, and please comment if you have any questions!