Ahmad has a jar containing only 5-cent and 20-cent coins. In total there are 31 coins with a total v

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Ahmad has a jar containing only 5-cent and 20-cent coins. In total there are 31 coins with a total value of $3.50. How many of each type of coin does Ahmad have?

Let the number of 5-cent coins be f.
Let the number of 20-cent coins be t.

We're given two equations:

1. f + t = 31
2. 0.05f + 0.2t = 3.50

We can solve this simultaneous system of equations 3 ways:

• Substitution Method
• Elimination Method
• Cramers Rule

No matter which method we choose, we get:

• f = 18
• t = 13