Subject: mathqa
Question: the ratio of the ages of maala and kala is 3 : 5 . the total of their ages is 3.2 decades . the proportion of their ages after 0.8 decades will be [ 1 decade = 10 years ]
Option: 
A: 7 : 9
B: 4 : 5
C: 3 : 6
D: 5 : 7
Answer: D