what is a number increased by 30, and then the result is tripled. If the answer is 141, what was the original number?
Let the number be n, then we have:
(n +30) X 3=141
3n +90=141
3n=141 - 90
3n=51
n=17, because: 17 + 30=47 X 3=141
30x3=90
141-90=51
51
