subtracted from a number and this difference is tripledthe result is 15 more than the number. the number

Answer 1

3(X-k) = x+15 where k is the number you did not specify

3x - 3k = x + 15

2x - 3k = 15

2x = 3x + 15

x = (3k + 15)/ 2 = (3/2)(k+5)

when you find the number that got cut off, plug it in there to find your answer