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MathNet 2017-part-06 — 176 problems (EN–VI) Question 54

Math Olympiad Vault · MathNet 2017-part-06 — 176 problems (EN–VI)

Question 54

The first number of a sequence of six numbers is $4$ and the last one is $47$. Every number from the third one on (inclusive) equals the sum of the previous two numbers. Let $S$ be the sum of all six numbers of the sequence. Then $S$ lies in the interval between
(A) $51$ and $90$
(B) $91$ and $100$
(C) $101$ and $110$
(D) $111$ and $120$
(E) $121$ and $160$