Marc Bryan is putting 1p and 5p coins in his piggy bank.
The total amount inside is 145p.
The number of 1p coins is 1 more than 3 times the number of 5p coins.
How many 1p and 5p coins are there?
Let = number of 1p coins.
Let = number of 5p coins.
We are told that: . .
The total value is: . .
Subtract  from : .
Substitute into : .