Question

multiply it by 2, add 50 & my answer is 74, what was my number

Answer 1

74 - 50 = 24
24 / 2 = 12 
12 * 2 + 50 = 74
Hope this helped :)

Answer 2

your number was 12.

let x be the number:

(x * 2) + 50 = 74

To solve for x, we need to reverse what was done to get the answer of 74.

Since 50 was added to arrive at 74, we deduct 50 from 74.

74 - 50 = 24

We then divide 24 by 2 to get the original number.

24/2 = 12.

Your number was 12.

To check:
(12 * 2) + 50 = 74
 24 + 50 = 74
74 = 74