A = {1, 2, 5, 6, 8}
{1} U {2, 5, 6, 8}
{2} U {1, 5, 6, 8}
{5} U {1, 2, 6, 8}
{6} U {1, 2, 5, 8}
{8} U {1, 2, 5, 6}
{1, 2} U {5, 6, 8}
{1, 5} U {2, 6, 8}
{1, 6} U {2, 5, 8}
{1, 8} U {2, 5, 6}
{1, 2, 5} U {6, 8}
{1, 2, 6} U {5, 8}
{1, 2, 8} U {5, 6}
{1, 5, 6} U {2, 8}
{1, 5, 8} U {2, 6}
{1, 6, 8} U {2, 5}
The answer is 15 distinct pairs of disjoint non-empty subsets.
After you (correctly) answered part-2, you knew the total bill . . .
(13.75 + 5%) + 15% on top of that.
(13.75) + (0.69) + (2.17) = $16.60 .
If they split the bill equally, each would pay (1/2) (16.60) = $8.30 .
But Arif wants to pay $3 more than Keisha.
Just take $1.50 away from Keisha's half (leave $6.80),
and add it on to Arif's half (make it $9.80). Then their
total is the same, but his share is $3 more than her share.
$9.80 + $6.80 = $16.60
$ 9.80 - $6.80 = $ 3.00 .
(3*7*4)-((3*7*4)/3 ) = 56ft³
Hope this helps! :)
