If you're reading this you love kabuchops

This year a grandmother, her daughter and her granddaughter noticed that the sum of their
ages is 100 years. Each of their ages is a power of 2. How old is the granddaughter?

And because I hate you guys add that to this thing below vvvv


 Nine buns cost £11 + pence and 13 buns cost £15 + pence, where
and .
a b 0 < a < 100
0 < b < 100
What is the cost of a bun?

And when you add these 2 up what pokemon is this?