SOLUTION: Please help, I am stuck...18/40=45/? I can't remember how to do these! Can anyone help me?

Algebra ->  Numeric Fractions Calculators, Lesson and Practice -> SOLUTION: Please help, I am stuck...18/40=45/? I can't remember how to do these! Can anyone help me?      Log On


   

Question 206686: Please help, I am stuck...18/40=45/? I can't remember how to do these! Can anyone help me?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Note: it is more common to see an 'x' instead of a '?' for unknown numbers.


18%2F40=45%2Fx Start with the given equation.


%2818%2F40%29%2Ax=45 Multiply both sides by x


18%2Ax=45%2A40 Multiply both sides by 40


18%2Ax=1800 Multiply


x=1800%2F18 Divide both sides by 18


x=100 Simplify



So the solution is x=100