
Ka N. answered 04/01/17
Tutor
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Certified High School Teacher Specialized in Math and ESL
It says that Sara has n blocks. We always write 5 more than as +5. Therefore,
Sara has 5 more than Greg.
Sara=Greg+5
n=Greg+5
Since you want to have an expression for Greg, you need to do the opposite of adding 5 to move that term to the other side. Hence, minus 5 on both sides.
n-5 = Greg
Greg has n-5
Tim has 3 more than Sara.
Tim = Sara +3
Tim = n + 3
Tim has n+3
Paul has 1.