Jack, Fred, and Sara have $3000.
When this sentence is translated from English to math, the equation is:
J + F + S = 3000
Fred has a quarter the money that Jack has.
F = 1/4 x J
Sara has ten times as much money as Fred.
S = 10 x F
How much money does Jack have?
J + F + S = 3000
J + 1/4 x J + 10 x F = 3000
5/4 x J + 10 x (1/4 x J) = 3000
1.25J + 2.50J = 3000
3.75J = 3000
J = 800
Jack has $800.
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