How old am I if 400 reduced by 3 times my age is 124?

[math_celebrity]

How old am I if 400 reduced by 3 times my age is 124?

Let my age be a. We're given an algebraic expression:

• 3 times my age means we multiply a by 3: 3a
• 400 reduced by 3 times my age means we subtract 3a from 400:
• 400 - 3a
• The word is mean an equation, so we set 400 - 3a equal to 124

400 - 3a = 124

To solve for a, we type this equation into our search engine and we get:
a = 92