Peter was thinking of a number. Peter doubles it and adds 0.8 to get an answer of 31. Form an equati

Discussion in 'Calculator Requests' started by math_celebrity, Jun 27, 2020.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    Peter was thinking of a number. Peter doubles it and adds 0.8 to get an answer of 31. Form an equation with x from the information.

    Take this algebraic expression in parts, starting with the unknown number x:
    • x
    • Double it means we multiply x by 2: 2x
    • Add 0.8: 2x + 0.8
    • The phrase to get an answer of means an equation. So we set 2x + 0.8 equal to 31
    Build our final algebraic expression:
    2x + 0.8 = 31

    If you have to solve for x, then we type this equation into our search engine and we get:
    x = 15.1
     

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