What is the next term of geometric sequence 24,12,6

Helena lost her marbles. but then she found them and put them in 44 bags with mm marbles in each bag. she had 33 marbles left over that didn't fit in the bags.

Given δjkl : δxyz, find x. a)10 b)12 c)16 d)20

Yvaries directly as x. y =90 when x=6. find y when x=13