P4 Question (Model)

Thanks Irene for sending in this P4 question. 

Question:

Patricia bought 2 bicycles n 5 tricycles. She paid $140 more for 5 tricycles than for 2 bicycles. If 2 bicycles cost as much as 3 tricycles, find the total cost of 1 bicycle n 1 tricycle.

Solution:

2 bicycles = 3 tricycles

changes all bicycles to tricycles in the model as followings: