Today: x=19
y=67+19=86
9 years ago: x=19-9=10
y=86-9=77
The total age 9 years ago: x+y=10+77=87
This looks hard... good luck ! :D
The Takbir, also transliterated as Tekbir or Takbeer. is the Arabic phrase Allahu akbar, usually translated as
"God is the greatest."
The formula for a cone is

insert 20 for your height and rearrange the formula to find the radius. Leave a comment if you need more help.