We have an unknown number, say "x" that needs to be solved:
Forming an equation from the sentences gives:
1/3 of a number x = \(\frac{x}{3}\)
7 more than a third of a number = 7 + \(\frac{x}{3}\)
But this all equals 57, so our equation is
7 + \(\frac{x}{3}\) = 57
Therefore, x=150