If Jim saved a total of $90 in 3 weeks, how much did he save in week 2?

1) Jim's average savings for the first 2 weeks were $20

2) Jim's first week's savings were half of his savings in week 2 and a third of his savings in week 3

Let F be Jim's first week savings, S for second week and T for third week.

Can Stmt 2 be interpreted as F = (S/2) + (T/3)?

Rather, can somebody explain, what are the rules for interpreting statements to correct equations, especially for the statement above?

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