There was one family lived in village. There were four members Two son and father and mother. Father and mother are 60 years old. One day Two brother gone America for study.. They are good in mathematics so They speak in mathematics language. One day elder brother said to younger brother ‘to Go in village to know about health of parents’. Younger brother gone village to check their parents health. After know about health, he return America and younger brother said to elder brother 32-32=0 and 1+2=3. Elder brother said ‘ok’.what the younger brother said that elder brother understand and said ok? This is the trick question.