The phrase a number means an arbitrary variable. We can pick any letter a-z except for i and e.
Let's choose x.
One-half a number means we divide x by2:
x/2
The word is means equal to. We set x/2 equal to 50 for our algebraic expression
x/2 = 50
If the problem asks us to solve for x, we cross multiply:
x = 2 * 50
x = 100
Let's choose x.
One-half a number means we divide x by2:
x/2
The word is means equal to. We set x/2 equal to 50 for our algebraic expression
x/2 = 50
If the problem asks us to solve for x, we cross multiply:
x = 2 * 50
x = 100