Here is a sequence problem that also tests your algebra:
The first term in a sequence is t. After the first term, each subsequent term is 3 greater than 1/3 of the preceding term. In terms of t, what is the ratio of the third term to the first term? (t is not equal to zero)
Answer: This one requires being systematic and keeping things straight.
Number in sequence: 1st 2nd 3rd
The terms are: t 3 + 1/3 t 3 + 1/3(3 + 1/3 t)
The ratio of the 3rd term to the 1st: (1/9 t + 4)/t or 1/9 + 4/t