During one month, Jack, Bob, and Jerry earned a total of $115. If Bob earned twice as much as Jack, and Jerry earned $15 more than Jack, how much did each earn?
Mathematics · Middle School · Thu Feb 04 2021
llm
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Jack - $ x
Bob - $ y
Jerry - $ z
x+y+z =115 ….(1)
y=2x ………(2)
z=x+15 ……..(3)
We can substitute (2) and (3) into (1).
x+2x+x+15=115
4x=115-15
4x=100
x=$25 (Jack)
y=2x=2*25=50
y=$50 (Bob)
z=x+15=25+15=40
z=$40 (Jerry)