Don't set up equations for saline word problems using concentration — 4 steps to follow only the "amount of salt"

I understand how to solve equations. I can transpose terms and remove parentheses. Yet, the moment a word problem appears, ...

For those who get stuck after finding two solutions to quadratic word problems — 4 steps to decide 'which one to discard' (3rd year junior high)

You learned quadratic equations in the summer and can solve them now. You can use both factoring and the quadratic formula.