Jane has 5 ten-cent coins, 3 twenty-cent coins and 1 fifty-cent coin. In how many different ways can she make up a sum of 80₵ ? Is the answer 4?
4 tens + 2 twenties
2 tens + 3 twenties
1 fifty + 3 tens
1 fifty + 1 ten + 1 twenty
That's all I see.