Funny Maths-Finding No of Son/s and Daughter/s or Brother/s and Sisters

Steps/Procedure:
    1. Ask the person to consider no of son/s or brother/s
    2. Add 3 to it.
    3. Multiply the answer by 5
    4. Add 20 to it.
    5. Double the Answer
    6. Add number of daughter/s or sister/s to previous answer
    7. Finally add 1.

Example:
        1. No of Son-                                1
        2. Add 3 to it. -                          1+3=4
        3. Multiply the answer by 5-      4 x 5 =20
        4. Add 20 to it.                         20 + 20 =40
        5. Double the Answer               40 + 40 =80
        6. Add number of daughter/s to previous answer                      80+1=81
        7. Finally add 1.                                                                      81+ 1 =82


Answer:
  Tell the audience to tell final answer. In Answer unit position corresponds to Daughter. 10 or 100 position corresponds to son. (From unit position subtract 1 and from 10 or 100 position subtract 7). If final answer less than 71 tell to audience as "You made Wrong Calculations". This can be also used to find no of brothers and sisters a person has.