If 4 Is Added To A Number And The Sum Is Tripled, The Result Is 30 More Than The Number. What Is The Number?

3(4+n) = 30 + n 12 + 3n = 30 + n    (use the distributive property to eliminate parentheses) 3n = 18 + n    (subtract 12 from both sides) 2n = 18    (subtract n from both sides) n = 9    (divide both sides by 2)

The number is 9.

Check   4+ 9 = 13    (4 is added to a number)   13*3 = 39 = 30 + 9    (triple the sum is 30 more than the number)