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36 is the answer

two of us 36 X 2 = 72

half of us 36/2 = 18

half half o us 36/4 = 9

Plus you = 1

72+18+9+1 = 100.

Make simple maths

2x + x/2+ x/4+1=100

2x + x/2 + x/4 = 99

8x + 2x + x/4 = 99

11x/4=99

x=99 * 4 / 11

x = 36

so simple

What else can I help you with?