Answer:
10
Step-by-step explanation:
two decades is equivalent to twenty years. However, you can also express 20 years using the word ‘score’ (although not common). An example is in the Gettysburg Address when Abraham Lincoln says, “Four score and seven years ago…” referring to the number of years ago we had become a new nation. That is 87 years (4X20=80, plus the 7). hehe
