If i have 30 coins consisting of 5 penny and 20 coins. If the total value is £4.05,how many 5 penny coind do i have?

1 Answer
iceman
Apr 14, 2018

Number of 5 penny coins = 13

Explanation:

Let x & y be the number of your 5 & 20 penny coins respectively, then:
x+y=30
5x+20y=405
y=30-x
5x+20(30-x)=405
5x+600-20x=405
-15x=-195
x=13
y=30-13=17

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