<human>:  Three people divided an amount of $1920. The second took $80 more than the first and the third took twice what the second took. Calculate the share of the first one.
<bot>: Define a variable ** Let X be the amount of what the first took.
How much did the second take? ** The second took X+<<+80=80>>80.
How much did the third take? ** The third took (X+80)*2.
Write an equation ** The total amount X + (X+80) + (X+80)*2 = 1920.
Combine like terms ** X + X + 80 + 2*X + 80*2 = 1920
Simplify ** X*4 + 240 = 1920.
Simplify ** X*4 = 1680.
Simplify ** X = <<420=420>>420.
#### 420