Consider X be total number of candies Sally had before giving any to her friend. We need to find X.

1) sally gave each friend 8 pieces of candy

INSUFFICIENT: We dont know number of friends and how many pieces are left after distributing the candies:

If there are 2 friends and 2 candies were left then X = 2*8+2=18

If there are 3 friends and 2 candies were left then X = 3*8+2=26

2) sally had 7 pieces of candy left after giving candy to her friends.

INSUFFICIENT: This choice doesn't tell number of friends and how many pieces she distributed per friend

If there are 2 friends and 1 candy was given per friend then X = 2*1+7= 9

If there are 3 friends and 1 candy was given per friend then X = 3*1+7= 10

Combining (1) & (2): gave each friend 8 pieces of candy & 7 pieces of candy left after distribution:

INSUFFICIENT: Even after combining we dont know the number of friends.

If there are 2 friends then x = 2*8+7= 23

If there are 3 friends then x = 3*8+7= 31

We cannot identify x (No. of pieces of candy Sally has) using any of above statements or combined.

Hence choice(E) is the answer. _________________

Thanks,

PraPon

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