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Equation for Jane: Total amount saved = 50 + 4d
Equation for Ellis: Total amount saved = 24 + 6d
Equation to find out when they have the same amount saved: 50 + 4d = 24 + 6d
Solving for d:
2d = 26
d = 13
After 13 days, Jane will have saved: 50 + 4(13) = $98
After 13 days, Ellis will have saved: 24 + 6(13) = $102