Question

Solve the riddleI am a number              tell my identity. take me two times over               and add a thirty six.to reach a century               and you still need four.

Answer 1

100 - 4 = 96
96 - 36 = 60
60/2 = 30 

Answer 2

let the no. be 'x'
twice of the no.=2x
According to the problem,
2x+36=100-4
2x+36+4=100
2x+40=100
2x=100-40
2x=60
x=60÷2
x=30