Simplifying Algebraic Expressions

Write an expression for each situation.  Simplify the expression.  

1.  John has y stickers.  He keeps 20 stickers for himself and gives the remainder to his two sisters equally.  How many stickers does each sister get?


2.  Kenny has m guppies and 10 angelfish.  He buys another 20 guppies and 30 angelfish.  How many fish does Kenny have now?


3.   8 + 12s - 7 - 9s + 4


Comment below to answer one or all questions.   Make sure to identify the problem you are solving.  
I will not display your answers until tomorrow afternoon.  

5.0A.1  I can use parentheses, brackets, or braces in numerical (and algebraic) expressions, and evaluate with these symbols.  

5.OA.2  I can write simple expressions that record calculations with numbers, and interpret numerical (and algebraic) expressions without evaluating them.