Answer:
Explanation:
a + 2 = 3....a = 3 - 2.....a = 1
b + 20 = 30....b = 30 - 20.....b = 10
c + 200 = 300.....c = 300 - 200.....c = 100
d + 2000 = 3000....d = 3000 - 2000.....d = 1000
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