小六升中一數學功課~急!!!!!!

1)change 0.63←(有循環點on top) into fractions
2)Find the L.C.M of 24,32,40
3)find the values of the unknowns:
a)2分之1(27-3x)=6 x=?
b)2+2分之x=7- 2分之3x x=?
4)Mr.Chu weighs W kg and Mr.Cahu is X kg heavier than Mr.Chu. If Mr.Chan is Y kg lighter than Mr.Chau, what is the reading if they both stand on a balance?
5)find the value: 100 is decreased by 100%
6)Find the height of a parallelogram if its corresponding base is 12 cm and the area is 96 cm2