Six people went into the woods to look for truffles. on average they collected 7 truffles per person. the average of the first four people to come back was 8 truffles per person. in fact, the fourth person to come back had 11 truffles in his basket. how many truffles did the last three people collect altogether?

1) Average of six people = # of truffles / 6 = 7 ⇒ # of truffles = 6*7 = 42.

2) Average of first four people = # of truffles of the first four / 4 = 8 ⇒ # of truffles of the first four = 4*8 = 36

3) # of truffles of the fourth person = 11

4) # of truffles of the first three people = 36 - 11 = 25

5) # of truffles of the last three people = 42 - 25 = 17

Answer 17.

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b. 2/3