Answer: My age is 78 years.
Step-by-step explanation:
Define my age first as a variable.
Let my age be x years
Reduced by means subtracted.
Subtract twice my age from 400 to get 244:
400 - 2x = 244
400 - 244 = 2x <-- make x positive and isolate it
156/2 = 2x/2 <-- 2x cancels out and becomes just x
78 = x
