Four yoga trainers A, B, C & D take classes in a month. Pie chart shows total hours distribution taken by these all four trainers to take classes....

Four yoga trainers A, B, C & D take
classes in a month. Pie chart shows total hours distribution
taken by these all four trainers to take classes. Read the
data carefully and answer the questions.

Note:
(i) They take classes for 1 hour (Basic classes), 2 hours
(Regular classes) and 3 hours (Advance classes). No
trainer can leave class before time and can not take
class for any extra time.
(ii) D does not take any regular classes. He will take either
basic or advance class.

Next month D takes 10 hours classes and he use three
hours at same pattern as previous month. If number of
basic classes taken by D in next month is twice the
advance classes, then find the difference between basic
and advance classes taken by him in next month?