In a fruit punch drink, the 3 ingredients are apple juice, orange juice and cranberry juice. If

1
4
of the drink is apple juice and
2
5
is orange juice then write the ratio of cranberry juice to apple juice to orange juice in its simplest form.

1/4 : 2/5 : (1 - 1/4 - 2/5) = 5/20 : 8/20 : 7/20 = 5:8:7

note how to type fractions online.