The ratio of the number of boy to the total number of girls is 1:3, or in fraction,
1/3.
The ratio of the number of students wearing red to the rest of the people is 2:2 and is 1:1
if simplified into its simplest form.

The ratio of the red coloured ground to the green is 1:2 or 1/2 in fraction.

The ratio of the blue packet of crackers to the red ones is 2:3 or 2/3 in fraction.

The ratio of the red patch to the white patch on the flag is 1:1.
The ratio of the number of cresent to the number of stars is 1:5 or 1/5 in fraction.

The ratio of the boy running to the boy walking is 1:1.

The ratio of the blue floor tile to the green floor tile to the light green floor tile is 1:1:1

The ratio of the number of teacher to the number of student is 1:3

The ratio of boys running to the girls walking 1:2

The ratio of the red shelve to the total number shelve is 1:4

the number of blue rabbit to the red rabbit is 1:1

The ratio of the number of boy to the total number of girls is 1:3, or in fraction,

1/3.

The ratio of the number of students wearing red to the rest of the people is 2:2 and is 1:1

if simplified into its simplest form.

The ratio of the red coloured ground to the green is 1:2 or 1/2 in fraction.

The ratio of the blue packet of crackers to the red ones is 2:3 or 2/3 in fraction.

The ratio of the red patch to the white patch on the flag is 1:1.

The ratio of the number of cresent to the number of stars is 1:5 or 1/5 in fraction.

The ratio of the boy running to the boy walking is 1:1.

The ratio of the blue floor tile to the green floor tile to the light green floor tile is 1:1:1

The ratio of the number of teacher to the number of student is 1:3

The ratio of boys running to the girls walking 1:2

The ratio of the red shelve to the total number shelve is 1:4

the number of blue rabbit to the red rabbit is 1:1