You work it backwards.
-- If there were 4 children and each child got 4 pieces,
then the children got (4 x 4) = 16 pieces altogether.
-- That's what was left after he took 2 pieces for himself.
So he started with (16 + 2) = <em>18 pieces</em>.
im sorry but did you ever get the answer?
Surface area = 2(12*12+15*12+15*12) = 1008
1008 * 4 = 4032
Answer: The correct option is c.
Explanation:
Reason for correct option:

This expression cannot be factored further because
is the complete factor. Therefore the option c is correct.
Reason for incorrect option:

Since the given expression can be factored further therefore the option d is incorrect.

Since the given expression can be factored further. Therefore the option a is incorrect.

Since the given expression can be factored further. Therefore the option b is incorrect.