1. The problem statement, all variables and given/known data A boy finds £2.10 in 20p, 10p and 2p coins. If there are 17 coins in all how many of each can he have? 2. Relevant equations Row ops. 3. The attempt at a solution I'm trying to come up with a few equations with which I can create a matrix. x1 = amount of 20p. x2 = amount of 10p. x3 = amount of 2p. So, 0.2(x1) + 0.1(x2) + 0.02(x3) = 2.10 and x1 + x2 + x3 = 17. Then, place the above in an augmented matrix and solve. Does this sound about right?