or
or
Today is Ratuls 12th birthday and his fathers 40th birthday. How many years from today will Ratul's father be twice as old as Ratuls at that time?
ধরি, x বছর পর রাতুলের বাবার বয়সের দ্বিগুন হবে।
40 + x = 2 ( 12 + x)
40 + x = 24 + 2x
2x - x = 40 - 24
c = 16
