Reduce the following fraction to its simplest form.
105分之63=
Arrange the fractions 6分之1 , 3分之1 and 4分之1 in ascending order of magnitude .
Write down
(a) the first five multiples of 2 which are not multiples of 3 .
(b) the first three multiples of 5 which are neither multiples of 2 nor multiples of 3 .
Arrange the fractions 5分之4 , 6分之5 and 3分之2 in descending order of magnitude .