- #1
SherlockOhms
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Homework Statement
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?
Homework Equations
Row ops.
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?