Find Total Hours For Robert

[nycmathguy]

Peter worked three times as many hours as Robert. Together they worked 72 hours. Show how you would find the number of hours Robert worked.

Peter = 3x

Robert = x

3x + x = 72

4x = 72

x = 72/4

x = 18

Robert worked 18 hours.

 

[MathLover1]

correct

 

[nycmathguy]

correct

I better get this stuff right or else give up on math, honestly.