From 5 times a certain number, 189 is subtracted, and the remainder is one half the original number. What is that number?

210

Step-by-step explanation:

Let the number be n. Then:

5n - 189 = (1/2) n. Multiplying all 3 terms by 2 to eliminate the fractional coefficient, we get:

10n - 1890 = n, or

9n = 1890.

Dividing both sides by 9 yields n = 210