The ages of mark and adam add up to 28 years total. mark is 20 years older than adam. how many years old is adam

Let x be the age of Mark, and y be the age of Adam. From the relationships given, we can formulate the following equations:

Eqn 1: x + y = 28
Eqn 2: x = 20 + y

Subsituting Eqn 2 to Eqn 1,
20 + y + y = 28
2y = 28 - 20 = 8
y = 8/2 = 4

Therefore, Adam is 4 years old.

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