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

[math_celebrity]

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