Answer:
The number is: 120
Explanation:
We have one-half of "a" decreased by 20 is 40
This means that:
(1/2)a-20=40
(1/2)a=60
a=120
120
Just add the 20 back to 40 and times by 2
40 + 20 = 60
60 * 2 = 120
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